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Reporting Segment Information - Additional Information (Detail) | 12 Months Ended
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Dec. 29, 2018 Segment Distribution_Centers Supermarkets PharmacyServices Fuel_Center
Segment Reporting Information [Line Items] |
Number of Reportable Segment | Segment | 3
Number of distribution centers | 14
Number of military distribution centers | 7
Number of corporate-owned retail stores | Supermarkets | 139
Number of retail stores offered pharmacy services | PharmacyServices | 83
Number of fuel centers operated | Fuel_Center | 29
Food Distribution [Member] |
Segment Reporting Information [Line Items] |
Number of military distribution centers | 2

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_DistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |