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Acquisitions - (Additional Information) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 28, 2024 Store RetailSegment | Dec. 28, 2024 USD ($) Store
Acquisition and Integration Costs | $ |  | $ 2.4
Number of Acquisitions | RetailSegment | 3 |
Metcalfe [Member] |  |
Number of Stores | 3 | 3
Number of Employees | 500 | 500
Fresh Encounter [Member] |  |
Number of Stores | 49 | 49
Number of Employees | 2,500 | 2,500
Markham [Member] |  |
Number of Stores | 3 | 3
Number of Employees | 40 | 40

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business Acquisitions Costs Of Acquired Entity Transaction Costs + References No definition available. + Details
Name: | sptn_BusinessAcquisitionsCostsOfAcquiredEntityTransactionCosts
Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of Acquisitions + References No definition available. + Details
Name: | sptn_NumberOfAcquisitions
Namespace Prefix: | sptn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=sptn_MetcalfeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=sptn_FreshEncounterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=sptn_MarkhamMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |