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Associate Retirement Plans - Assumed Current Healthcare Cost Trend Rates Used to Determine Net Periodic Benefit Cost (Income) (Detail) | 12 Months Ended
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Dec. 30, 2023
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |
Post-65 | 7.00%

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- Definition Defined benefit plan health care cost trend rate assumed for post sixty five year age. + References No definition available. + Details
Name: | sptn_DefinedBenefitPlanHealthCareCostTrendRateAssumedForPostSixtyFiveYearAge
Namespace Prefix: | sptn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanAssumedHealthCareCostTrendRatesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration