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    <link:label id="lab_us-gaap_BusinessCombinationDisclosureTextBlock_EDA72C68EEDB80ECAF2A8738824E485A_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationDisclosureTextBlock_154E54FC95695EBCAFAA544108F10560" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_GrossProfit_F9C161D8C7A9B9EA506113EBE10A21AA_label_en-US" xlink:label="lab_us-gaap_GrossProfit_F9C161D8C7A9B9EA506113EBE10A21AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gross Profit</link:label>
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    <link:label id="lab_us-gaap_OperatingExpensesAbstract_539C3CCE18EEAAF51A2213EBE10A9E53_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_539C3CCE18EEAAF51A2213EBE10A9E53" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Expenses [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_539C3CCE18EEAAF51A2213EBE10A9E53" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SellingExpense_D47E4183489B759757BF13EBE10AADE4_label_en-US" xlink:label="lab_us-gaap_SellingExpense_D47E4183489B759757BF13EBE10AADE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling Expense</link:label>
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    <link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_CB2DCF1DF7C619C74B3C13EBE10AC400_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_CB2DCF1DF7C619C74B3C13EBE10AC400" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General and Administrative Expense</link:label>
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    <link:label id="lab_atk_IntangibleassetsinprogressMember_0030295AB1079483070A41225372050F_label_en-US" xlink:label="lab_atk_IntangibleassetsinprogressMember_B57C443DBD365041AAB588A5A00B4A5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible assets in progress [Member]</link:label>
    <link:label id="lab_atk_IntangibleassetsinprogressMember_0030295AB1079483070A41225372050F_documentation_en-US" xlink:label="lab_atk_IntangibleassetsinprogressMember_B57C443DBD365041AAB588A5A00B4A5D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Intangible assets in progress</link:label>
    <link:loc xlink:href="atk-20200530.xsd#atk_IntangibleassetsinprogressMember" xlink:label="loc_atk_IntangibleassetsinprogressMember_B57C443DBD365041AAB588A5A00B4A5D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_atk_IntangibleassetsinprogressMember_B57C443DBD365041AAB588A5A00B4A5D" xlink:to="lab_atk_IntangibleassetsinprogressMember_B57C443DBD365041AAB588A5A00B4A5D" xlink:type="arc" />
    <link:label id="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_0041B7999977CEB5F80940E7C5E01FBB_terseLabel_en-US" xlink:label="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_4C516E50082E5850B1ECECBEB498CDD4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible assets with finite lives:</link:label>
    <link:label id="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_0041B7999977CEB5F80940E7C5E01FBB_label_en-US" xlink:label="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_4C516E50082E5850B1ECECBEB498CDD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquired Finite-Lived Intangible Assets [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_4C516E50082E5850B1ECECBEB498CDD4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_4C516E50082E5850B1ECECBEB498CDD4" xlink:to="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_4C516E50082E5850B1ECECBEB498CDD4" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_BF4A2664D21FF417CF7740E7C5E066DC_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_800F5D54D33A5F478B56D37AD2EBA4FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Useful life</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_BF4A2664D21FF417CF7740E7C5E066DC_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_800F5D54D33A5F478B56D37AD2EBA4FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Asset, Useful Life</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_800F5D54D33A5F478B56D37AD2EBA4FD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_800F5D54D33A5F478B56D37AD2EBA4FD" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_800F5D54D33A5F478B56D37AD2EBA4FD" xlink:type="arc" />
    <link:label id="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_7C0DD310999AB330B31540E7C5E1FC90_totalLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_10AF8E6102F3544197E9521052DBEEFF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Intangible assets, Gross carrying amount</link:label>
    <link:label id="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_7C0DD310999AB330B31540E7C5E1FC90_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_10AF8E6102F3544197E9521052DBEEFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible Assets, Gross (Excluding Goodwill)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_10AF8E6102F3544197E9521052DBEEFF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_10AF8E6102F3544197E9521052DBEEFF" xlink:to="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_10AF8E6102F3544197E9521052DBEEFF" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_300DC3B65F2963931C7140E7C5E1E493_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_8424B36161395D70A208C353D6835D2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-lived intangible assets, Gross carrying amount</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_300DC3B65F2963931C7140E7C5E1E493_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_8424B36161395D70A208C353D6835D2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_8424B36161395D70A208C353D6835D2A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsGross_8424B36161395D70A208C353D6835D2A" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsGross_8424B36161395D70A208C353D6835D2A" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_AEAE93BBBC91C172D62F40E7C5E1D576_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_011A6193393450E4BE604BD52948E9FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated amortization</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_AEAE93BBBC91C172D62F40E7C5E1D576_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_011A6193393450E4BE604BD52948E9FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Accumulated Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_011A6193393450E4BE604BD52948E9FD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_011A6193393450E4BE604BD52948E9FD" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_011A6193393450E4BE604BD52948E9FD" xlink:type="arc" />
    <link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_29343A49E69C3B934FBF40E7C5E1E5B1_totalLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_FF79DB8D1FD056A5B14DC6860403E964" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Intangible assets, Net carrying amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_FF79DB8D1FD056A5B14DC6860403E964" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_FF79DB8D1FD056A5B14DC6860403E964" xlink:to="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_FF79DB8D1FD056A5B14DC6860403E964" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_AA013783F9BB325F018840E7C5E1DAE0_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_FEB22A730427551DA46B8A838C59F824" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Indefinite-Lived Intangible Assets [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_AA013783F9BB325F018840E7C5E1DAE0_label_en-US" xlink:label="lab_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_FEB22A730427551DA46B8A838C59F824" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Indefinite-Lived Intangible Assets [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_FEB22A730427551DA46B8A838C59F824" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_FEB22A730427551DA46B8A838C59F824" xlink:to="lab_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_FEB22A730427551DA46B8A838C59F824" xlink:type="arc" />
    <link:label id="lab_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_AB317DCC1A7A1A059DF740E7C5E22AFB_terseLabel_en-US" xlink:label="lab_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_677DED0FDB4756ABA8FCE95B39B4ECD4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible assets with indefinite lives:</link:label>
    <link:label id="lab_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_AB317DCC1A7A1A059DF740E7C5E22AFB_label_en-US" xlink:label="lab_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_677DED0FDB4756ABA8FCE95B39B4ECD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Indefinite-lived Intangible Assets [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_677DED0FDB4756ABA8FCE95B39B4ECD4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_677DED0FDB4756ABA8FCE95B39B4ECD4" xlink:to="lab_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_677DED0FDB4756ABA8FCE95B39B4ECD4" xlink:type="arc" />
    <link:label id="lab_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_41DC01336203AFE2972540E7C5E3F0D6_terseLabel_en-US" xlink:label="lab_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_52927F3B1AE451CA85AED9DCE2A40EA1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Indefinite-lived intangible assets</link:label>
    <link:label id="lab_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_41DC01336203AFE2972540E7C5E3F0D6_label_en-US" xlink:label="lab_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_52927F3B1AE451CA85AED9DCE2A40EA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Indefinite-lived Intangible Assets (Excluding Goodwill)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_52927F3B1AE451CA85AED9DCE2A40EA1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_52927F3B1AE451CA85AED9DCE2A40EA1" xlink:to="lab_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_52927F3B1AE451CA85AED9DCE2A40EA1" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeasesAbstract_0A7EC2B354A38071C96BE267B70B3BC2_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_0A7EC2B354A38071C96BE267B70B3BC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_0A7EC2B354A38071C96BE267B70B3BC2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeasesAbstract_0A7EC2B354A38071C96BE267B70B3BC2" xlink:to="lab_us-gaap_LeasesAbstract_0A7EC2B354A38071C96BE267B70B3BC2" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseCostAbstract_1371A0C5C95A76589E22E267B70CFD5E_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostAbstract_1371A0C5C95A76589E22E267B70CFD5E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of lease expense</link:label>
    <link:label id="lab_us-gaap_LeaseCostAbstract_1371A0C5C95A76589E22E267B70CFD5E_label_en-US" xlink:label="lab_us-gaap_LeaseCostAbstract_1371A0C5C95A76589E22E267B70CFD5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCostAbstract" xlink:label="loc_us-gaap_LeaseCostAbstract_1371A0C5C95A76589E22E267B70CFD5E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeaseCost_E0874B0B96F0BDF41205E267B70CA93A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_E0874B0B96F0BDF41205E267B70CA93A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease cost</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseCost_E0874B0B96F0BDF41205E267B70CA93A_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_E0874B0B96F0BDF41205E267B70CA93A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_E0874B0B96F0BDF41205E267B70CA93A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_VariableLeaseCost_08D7E41A05D38E34D532E267B70D4B6A_label_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_08D7E41A05D38E34D532E267B70D4B6A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableLeaseCost" xlink:label="loc_us-gaap_VariableLeaseCost_08D7E41A05D38E34D532E267B70D4B6A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeaseExpense_7316DAA77BFDCFA0924DE267B70E305C_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseExpense_7316DAA77BFDCFA0924DE267B70E305C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseExpense" xlink:label="loc_us-gaap_OperatingLeaseExpense_7316DAA77BFDCFA0924DE267B70E305C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShortTermLeaseCost_2AA5655049CE0C141D28E267B70E56AA_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_2AA5655049CE0C141D28E267B70E56AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Short term lease cost</link:label>
    <link:label id="lab_us-gaap_ShortTermLeaseCost_2AA5655049CE0C141D28E267B70E56AA_label_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_2AA5655049CE0C141D28E267B70E56AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Short-term Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="loc_us-gaap_ShortTermLeaseCost_2AA5655049CE0C141D28E267B70E56AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShortTermLeaseCost_2AA5655049CE0C141D28E267B70E56AA" xlink:to="lab_us-gaap_ShortTermLeaseCost_2AA5655049CE0C141D28E267B70E56AA" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_588CA0066C282662D4DEE267B70E74ED_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_588CA0066C282662D4DEE267B70E74ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of right-of use assets</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_588CA0066C282662D4DEE267B70E74ED_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_588CA0066C282662D4DEE267B70E74ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Right-of-Use Asset, Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_588CA0066C282662D4DEE267B70E74ED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_588CA0066C282662D4DEE267B70E74ED" xlink:to="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_588CA0066C282662D4DEE267B70E74ED" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseInterestExpense_2AD6268E94EAFF5BEA68E267B70E039F_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_2AD6268E94EAFF5BEA68E267B70E039F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest on lease liabilities</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseInterestExpense_2AD6268E94EAFF5BEA68E267B70E039F_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_2AD6268E94EAFF5BEA68E267B70E039F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Interest Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseInterestExpense" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_2AD6268E94EAFF5BEA68E267B70E039F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseInterestExpense_2AD6268E94EAFF5BEA68E267B70E039F" xlink:to="lab_us-gaap_FinanceLeaseInterestExpense_2AD6268E94EAFF5BEA68E267B70E039F" xlink:type="arc" />
    <link:label id="lab_atk_Financeleasecost_905AD8998BE10D2EFEDEE267B70EFF57_totalLabel_en-US" xlink:label="lab_atk_Financeleasecost_905AD8998BE10D2EFEDEE267B70EFF57" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total finance lease cost</link:label>
    <link:label id="lab_atk_Financeleasecost_905AD8998BE10D2EFEDEE267B70EFF57_label_en-US" xlink:label="lab_atk_Financeleasecost_905AD8998BE10D2EFEDEE267B70EFF57" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance lease cost</link:label>
    <link:label id="lab_atk_Financeleasecost_905AD8998BE10D2EFEDEE267B70EFF57_documentation_en-US" xlink:label="lab_atk_Financeleasecost_905AD8998BE10D2EFEDEE267B70EFF57" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Finance lease cost</link:label>
    <link:loc xlink:href="atk-20200530.xsd#atk_Financeleasecost" xlink:label="loc_atk_Financeleasecost_905AD8998BE10D2EFEDEE267B70EFF57" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_atk_Financeleasecost_905AD8998BE10D2EFEDEE267B70EFF57" xlink:to="lab_atk_Financeleasecost_905AD8998BE10D2EFEDEE267B70EFF57" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseCost_8A3918EE9F2B9711825AE267B70F07A9_totalLabel_en-US" xlink:label="lab_us-gaap_LeaseCost_8A3918EE9F2B9711825AE267B70F07A9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease cost</link:label>
    <link:label id="lab_us-gaap_LeaseCost_8A3918EE9F2B9711825AE267B70F07A9_label_en-US" xlink:label="lab_us-gaap_LeaseCost_8A3918EE9F2B9711825AE267B70F07A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_8A3918EE9F2B9711825AE267B70F07A9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCost_8A3918EE9F2B9711825AE267B70F07A9" xlink:to="lab_us-gaap_LeaseCost_8A3918EE9F2B9711825AE267B70F07A9" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsAndLiabilitiesLesseeAbstract_7F6EDDA08C64C9F6F895E267B70F0E27_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAndLiabilitiesLesseeAbstract_7F6EDDA08C64C9F6F895E267B70F0E27" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets and liabilities, lessee</link:label>
    <link:label id="lab_us-gaap_AssetsAndLiabilitiesLesseeAbstract_7F6EDDA08C64C9F6F895E267B70F0E27_label_en-US" xlink:label="lab_us-gaap_AssetsAndLiabilitiesLesseeAbstract_7F6EDDA08C64C9F6F895E267B70F0E27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets and Liabilities, Lessee [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAndLiabilitiesLesseeAbstract" xlink:label="loc_us-gaap_AssetsAndLiabilitiesLesseeAbstract_7F6EDDA08C64C9F6F895E267B70F0E27" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsAndLiabilitiesLesseeAbstract_7F6EDDA08C64C9F6F895E267B70F0E27" xlink:to="lab_us-gaap_AssetsAndLiabilitiesLesseeAbstract_7F6EDDA08C64C9F6F895E267B70F0E27" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_726E593A421966EE7C65E267B70F39B6_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_726E593A421966EE7C65E267B70F39B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease, right-of-use asset</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_726E593A421966EE7C65E267B70F39B6_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_726E593A421966EE7C65E267B70F39B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Right-of-Use Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_726E593A421966EE7C65E267B70F39B6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseRightOfUseAsset_726E593A421966EE7C65E267B70F39B6" xlink:to="lab_us-gaap_OperatingLeaseRightOfUseAsset_726E593A421966EE7C65E267B70F39B6" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAsset_CB14FFB6A9C72FF2CD08E267B70F8313_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAsset_CB14FFB6A9C72FF2CD08E267B70F8313" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease, right-of-use asset</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAsset_CB14FFB6A9C72FF2CD08E267B70F8313_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAsset_CB14FFB6A9C72FF2CD08E267B70F8313" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Right-of-Use Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_CB14FFB6A9C72FF2CD08E267B70F8313" xlink:type="locator" />
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    <link:label id="lab_atk_Leaserightofuseasset_014398242DF0F28CE05BE267B710F3BC_totalLabel_en-US" xlink:label="lab_atk_Leaserightofuseasset_014398242DF0F28CE05BE267B710F3BC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease assets</link:label>
    <link:label id="lab_atk_Leaserightofuseasset_014398242DF0F28CE05BE267B710F3BC_label_en-US" xlink:label="lab_atk_Leaserightofuseasset_014398242DF0F28CE05BE267B710F3BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">lease right of use asset</link:label>
    <link:label id="lab_atk_Leaserightofuseasset_014398242DF0F28CE05BE267B710F3BC_documentation_en-US" xlink:label="lab_atk_Leaserightofuseasset_014398242DF0F28CE05BE267B710F3BC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">lease right of use asset</link:label>
    <link:loc xlink:href="atk-20200530.xsd#atk_Leaserightofuseasset" xlink:label="loc_atk_Leaserightofuseasset_014398242DF0F28CE05BE267B710F3BC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_atk_Leaserightofuseasset_014398242DF0F28CE05BE267B710F3BC" xlink:to="lab_atk_Leaserightofuseasset_014398242DF0F28CE05BE267B710F3BC" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_EBDB899C9EE9649392EAE267B710821B_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_EBDB899C9EE9649392EAE267B710821B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease, liability, current</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_EBDB899C9EE9649392EAE267B710821B_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_EBDB899C9EE9649392EAE267B710821B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Liability, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_EBDB899C9EE9649392EAE267B710821B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityCurrent_EBDB899C9EE9649392EAE267B710821B" xlink:to="lab_us-gaap_OperatingLeaseLiabilityCurrent_EBDB899C9EE9649392EAE267B710821B" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityCurrent_6D387C326932EE64C23AE267B71096C9_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityCurrent_6D387C326932EE64C23AE267B71096C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease, liability, current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_6D387C326932EE64C23AE267B71096C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityCurrent_6D387C326932EE64C23AE267B71096C9" xlink:to="lab_us-gaap_FinanceLeaseLiabilityCurrent_6D387C326932EE64C23AE267B71096C9" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_61205AA41852B3BAE712E267B710B60E_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_61205AA41852B3BAE712E267B710B60E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease, liability, noncurrent</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_61205AA41852B3BAE712E267B710B60E_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_61205AA41852B3BAE712E267B710B60E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Liability, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_61205AA41852B3BAE712E267B710B60E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_61205AA41852B3BAE712E267B710B60E" xlink:to="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_61205AA41852B3BAE712E267B710B60E" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_7509A3EA9A2ECEBC8B46E267B710ED95_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_7509A3EA9A2ECEBC8B46E267B710ED95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease, liability, noncurrent</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_7509A3EA9A2ECEBC8B46E267B710ED95_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_7509A3EA9A2ECEBC8B46E267B710ED95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_7509A3EA9A2ECEBC8B46E267B710ED95" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_7509A3EA9A2ECEBC8B46E267B710ED95" xlink:to="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_7509A3EA9A2ECEBC8B46E267B710ED95" xlink:type="arc" />
    <link:label id="lab_atk_Leaseliability_83E0604D5DFF8996A73BE267B7106A1E_totalLabel_en-US" xlink:label="lab_atk_Leaseliability_83E0604D5DFF8996A73BE267B7106A1E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease liabilities</link:label>
    <link:label id="lab_atk_Leaseliability_83E0604D5DFF8996A73BE267B7106A1E_label_en-US" xlink:label="lab_atk_Leaseliability_83E0604D5DFF8996A73BE267B7106A1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">lease liability</link:label>
    <link:label id="lab_atk_Leaseliability_83E0604D5DFF8996A73BE267B7106A1E_documentation_en-US" xlink:label="lab_atk_Leaseliability_83E0604D5DFF8996A73BE267B7106A1E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">lease liability</link:label>
    <link:loc xlink:href="atk-20200530.xsd#atk_Leaseliability" xlink:label="loc_atk_Leaseliability_83E0604D5DFF8996A73BE267B7106A1E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_atk_Leaseliability_83E0604D5DFF8996A73BE267B7106A1E" xlink:to="lab_atk_Leaseliability_83E0604D5DFF8996A73BE267B7106A1E" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_C1DC63E59F44DA1EFFBFE267B710BA3B_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_C1DC63E59F44DA1EFFBFE267B710BA3B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Future maturities of lease liabilities, operating leases</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_C1DC63E59F44DA1EFFBFE267B710BA3B" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_1EF9CFD7ECE2124229BBE26BFC78BBF7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LeaseAndRentalExpense_038CF6A77AFB9A68F54EE26BFCD56A0F_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_038CF6A77AFB9A68F54EE26BFCD56A0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rent expense</link:label>
    <link:label id="lab_us-gaap_LeaseAndRentalExpense_038CF6A77AFB9A68F54EE26BFCD56A0F_label_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_038CF6A77AFB9A68F54EE26BFCD56A0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseAndRentalExpense" xlink:label="loc_us-gaap_LeaseAndRentalExpense_038CF6A77AFB9A68F54EE26BFCD56A0F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C412C76C8FB5B5097B25E26BFCD515FE_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C412C76C8FB5B5097B25E26BFCD515FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C412C76C8FB5B5097B25E26BFCD515FE_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C412C76C8FB5B5097B25E26BFCD515FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C412C76C8FB5B5097B25E26BFCD515FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C412C76C8FB5B5097B25E26BFCD515FE" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C412C76C8FB5B5097B25E26BFCD515FE" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_578B05CC0B3FEDBD4B30E26BFCD599BD_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_578B05CC0B3FEDBD4B30E26BFCD599BD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_2A78ADC0FA332188DE83E26BFCD6D70F_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_2A78ADC0FA332188DE83E26BFCD6D70F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_2A78ADC0FA332188DE83E26BFCD6D70F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_2A78ADC0FA332188DE83E26BFCD6D70F" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_2A78ADC0FA332188DE83E26BFCD6D70F" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3D5A30B004E76D3BC921E26BFCD6D0D6_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3D5A30B004E76D3BC921E26BFCD6D0D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3D5A30B004E76D3BC921E26BFCD6D0D6" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3D5A30B004E76D3BC921E26BFCD6D0D6" xlink:type="arc" />
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    <link:label id="lab_us-gaap_AmortizationOfFinancingCostsAndDiscounts_B64BBC64533943E1E996E26B4C2FA87F_label_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCostsAndDiscounts_B64BBC64533943E1E996E26B4C2FA87F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Debt Issuance Costs and Discounts</link:label>
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    <link:label id="lab_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_3807F56D0034E105858AE26B4C30BB74_netLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_3807F56D0034E105858AE26B4C30BB74" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US">Loss on fair value change of contingent consideration - TRA liability</link:label>
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    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_9A178DA97C409F7DFC1DE26B4C30562F_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_9A178DA97C409F7DFC1DE26B4C30562F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_9A178DA97C409F7DFC1DE26B4C30562F_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_9A178DA97C409F7DFC1DE26B4C30562F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_9A178DA97C409F7DFC1DE26B4C30562F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_97B0A2782A39832F8EA6E26B4C307754_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_97B0A2782A39832F8EA6E26B4C307754" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Loss on disposal of property and equipment</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_97B0A2782A39832F8EA6E26B4C307754_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_97B0A2782A39832F8EA6E26B4C307754" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Disposition of Property Plant Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_97B0A2782A39832F8EA6E26B4C307754" xlink:type="locator" />
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    <link:label id="lab_atk_Amortizationofoperatingleaserightofuseasset_EBE1369A5BEB4922B85CE26B4C319C90_terseLabel_en-US" xlink:label="lab_atk_Amortizationofoperatingleaserightofuseasset_EBE1369A5BEB4922B85CE26B4C319C90" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of operating lease right-of-use asset</link:label>
    <link:label id="lab_atk_Amortizationofoperatingleaserightofuseasset_EBE1369A5BEB4922B85CE26B4C319C90_label_en-US" xlink:label="lab_atk_Amortizationofoperatingleaserightofuseasset_EBE1369A5BEB4922B85CE26B4C319C90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of operating lease right-of-use asset</link:label>
    <link:label id="lab_atk_Amortizationofoperatingleaserightofuseasset_EBE1369A5BEB4922B85CE26B4C319C90_documentation_en-US" xlink:label="lab_atk_Amortizationofoperatingleaserightofuseasset_EBE1369A5BEB4922B85CE26B4C319C90" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amortization of operating lease right-of-use asset</link:label>
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    <link:label id="lab_us-gaap_OtherOperatingActivitiesCashFlowStatement_E116D44B21D1EC994207E26B4C31BE2F_terseLabel_en-US" xlink:label="lab_us-gaap_OtherOperatingActivitiesCashFlowStatement_E116D44B21D1EC994207E26B4C31BE2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other operating activities</link:label>
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