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Share-Based Payments - Summary of Stock-Based Payment Expense Recognized Included as a Reduction of Net Sales in Consolidated Statements of Operations (Detail) $ in Thousands	12 Months Ended
	Jan. 02, 2021 USD ($)
Employee Service Share Based Compensation Aggregate Disclosures [Abstract]
Warrants expense	$ 6,549
Tax benefits	(2,051)
Stock-based compensation expense, net of tax	$ 4,498

X

- Definition

Class of warrant or right expense before tax.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Class of warrant or right income tax expense (benefit).

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Class of warrant or right stock based compensation expense net of tax.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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