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Reporting Segment Information - Additional Information (Detail)	12 Months Ended
	Jan. 02, 2016 Segment Distribution_Centers Supermarkets PharmacyServices Fuel_Center
Segment Reporting [Abstract]
Number of Reportable Segment | Segment	3
Number of distribution centers	12
Number of military distribution centers	7
Number of corporate-owned retail stores | Supermarkets	163
Number of retail stores offering pharmacy services | PharmacyServices	91
Number of fuel centers operated | Fuel_Center	29

X

- Definition

Number of corporate-owned retail stores.

+ References

No definition available.

+ Details

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

X

- Definition

Number of food distribution centers.

+ References

No definition available.

+ Details

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

X

- Definition

Number of fuel centers operated.

+ References

No definition available.

+ Details

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

X

- Definition

Number of military distribution centers.

+ References

No definition available.

+ Details

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

X

- Definition

Number of retail stores offers pharmacy services.

+ References

No definition available.

+ Details

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

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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