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Associate Retirement Plans - Effect of Assumed Health Care Cost Rate on Post Retirement Plan Reported (Detail)	9 Months Ended	12 Months Ended
	Dec. 28, 2013	Jan. 03, 2015	Mar. 30, 2013
Defined Benefit Plan Assumed Health Care Cost Trend Rates [Abstract]
Pre – 65	8.00%sptn_DefinedBenefitPlanHealthCareCostTrendRateAssumedForPreSixtyFiveYearAge	7.75%sptn_DefinedBenefitPlanHealthCareCostTrendRateAssumedForPreSixtyFiveYearAge	8.50%sptn_DefinedBenefitPlanHealthCareCostTrendRateAssumedForPreSixtyFiveYearAge
Post – 65	7.00%sptn_DefinedBenefitPlanHealthCareCostTrendRateAssumedForPostSixtyFiveYearAge	6.85%sptn_DefinedBenefitPlanHealthCareCostTrendRateAssumedForPostSixtyFiveYearAge	7.50%sptn_DefinedBenefitPlanHealthCareCostTrendRateAssumedForPostSixtyFiveYearAge

X

- Definition

Defined benefit plan health care cost trend rate assumed for post sixty five year age.

+ References

No definition available.

+ Details

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X

- Definition

Defined benefit plan health care cost trend rate assumed for pre sixty five year age.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
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Period Type:	duration

X

- Details

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