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Commitments and Contingencies - Additional Information (Detail)	Apr. 24, 2021 Employer
Commitments And Contingencies Disclosure [Abstract]
Number of employers contributing to plan	1

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