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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. 02, 2016	Jan. 03, 2015
Defined Benefit Plan Assumed Health Care Cost Trend Rates [Abstract]
Pre-65	8.00%	7.50%	7.75%
Post-65	7.00%	8.40%	6.85%

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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

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- 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_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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