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Commitments and Contingencies - Additional Information (Detail) | Jul. 09, 2021
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Commitments And Contingencies Disclosure [Abstract] |
Multiemployer plan number of years relief from risk of insolvency | 30 years

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- Definition Multiemployer plan number of years relief from risk of insolvency. + References No definition available. + Details
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Namespace Prefix: | sptn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration