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Commitments and Contingencies - Additional Information (Detail) - Norfolk, Virginia facility	6 Months Ended
	Jul. 16, 2016
Commitments And Contingencies [Line Items]
Collective bargaining agreement term	3 years
Collective bargaining agreement term, start date	Apr. 23, 2016
Collective bargaining agreement term, end date	Apr. 27, 2019

X

- Definition

Collective bargaining agreement term.

+ References

No definition available.

+ Details

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X

- Definition

Collective bargaining agreement term, end date.

+ References

No definition available.

+ Details

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X

- Definition

Collective bargaining agreement term, start date.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Commitments and Contingencies.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: