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Reporting Segment Information - Additional Information (Detail)	12 Months Ended
	Jan. 03, 2015 Segment PharmacyServices Fuel_Center Distribution_Centers Supermarkets
Segment Reporting [Abstract]
Number of Reportable Segment	3us-gaap_NumberOfReportableSegments
Number of distribution centers	12sptn_NumberOfFoodDistributionCenters
Number of military distribution centers	8sptn_NumberOfMilitaryDistributionCenters
Number of supermarkets	162sptn_NumberOfSupermarkets
Number of supermarkets offers pharmacy services	79sptn_NumberOfSupermarketsOffersPharmacyServices
Number of fuel centers operated	29sptn_NumberOfFuelCentersOperated

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 supermarkets.

+ References

No definition available.

+ Details

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

X

- Definition

Number of supermarkets offers pharmacy services.

+ References

No definition available.

+ Details

Name:	sptn_NumberOfSupermarketsOffersPharmacyServices
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

- Details

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