XML 57 R47.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Commitments and Contingencies - Additional Information (Detail) - Norfolk, Virginia facility | 6 Months Ended
--- | ---
Jul. 16, 2016
Commitments And Contingencies [Line Items] |
Collective bargaining agreement term | 3 years
Collective bargaining agreement term, start date | Apr. 23, 2016
Collective bargaining agreement term, end date | Apr. 27, 2019

X
- Definition Collective bargaining agreement term. + References No definition available. + Details
Name: | sptn_CollectiveBargainingAgreementTerm
Namespace Prefix: | sptn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Collective bargaining agreement term, end date. + References No definition available. + Details
Name: | sptn_CollectiveBargainingAgreementTermEndDate
Namespace Prefix: | sptn_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Collective bargaining agreement term, start date. + References No definition available. + Details
Name: | sptn_CollectiveBargainingAgreementTermStartDate
Namespace Prefix: | sptn_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Commitments and Contingencies. + References No definition available. + Details
Name: | sptn_CommitmentsAndContingenciesLineItems
Namespace Prefix: | sptn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementGeographicalAxis=sptn_NorfolkVirginiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |