XML 99 R84.htm IDEA: XBRL DOCUMENT v3.24.0.1

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

X

- 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

X

- References

No definition available.

+ Details

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