Income Tax - Summary of Deferred Tax Assets and Liabilities (Parenthetical) (Detail)	12 Months Ended
Jan. 01, 2022
Income Tax Expense Benefit Continuing Operations [Line Items]
Federal credit carryforwards expire year	2041
State and Local Jurisdiction
Income Tax Expense Benefit Continuing Operations [Line Items]
Net operating losses, expiration date, description	expire in tax years 2022 through 2041 if not utilized

Deferred tax assets, federal tax credit carryforwards, expiration year.

No definition available.

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