XML 118 R99.htm IDEA: XBRL DOCUMENT v3.6.0.2

Reporting Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 Segment Distribution_Centers Supermarkets PharmacyServices Fuel_Center
Segment Reporting Information [Line Items]
Number of Reportable Segment | Segment	3
Number of distribution centers	11
Number of military distribution centers	7
Number of corporate-owned retail stores | Supermarkets	157
Number of retail stores offered pharmacy services | PharmacyServices	90
Number of fuel centers operated | Fuel_Center	30
Military [Member]
Segment Reporting Information [Line Items]
Number of distribution centers	1
Food Distribution [Member]
Segment Reporting Information [Line Items]
Number of military distribution centers	1

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 offered pharmacy services.

+ References

No definition available.

+ Details

Name:	sptn_NumberOfRetailStoresOfferedPharmacyServices
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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sptn_MilitaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sptn_DistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: