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Commitments and Contingencies - Additional Information (Detail) - Employer	Jul. 09, 2021	Jul. 17, 2021
Commitments And Contingencies Disclosure [Abstract]
Number of employers contributing to plan		1
Multiemployer plan number of years relief from risk of insolvency	30 years

X

- Definition

Multiemployer plan number of years relief from risk of insolvency.

+ References

No definition available.

+ Details

Name:	sptn_MultiemployerPlanNumberOfYearsReliefFromRiskOfInsolvency
Namespace Prefix:	sptn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of employers.

+ References

No definition available.

+ Details

Name:	sptn_NumberOfEmployers
Namespace Prefix:	sptn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration