Summary of Significant Accounting Policies and Basis of Presentation - Summary of Changes in SpartanNash's Self-Insurance Liability (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Balance at beginning of year	$ 18,179	$ 18,157	$ 19,445
Expenses	62,827	63,722	64,386
Claim payments, net of employee contributions	(60,077)	(63,700)	(65,674)
Balance at end of year	$ 20,929	$ 18,179	$ 18,157

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Name:	us-gaap_SelfInsuranceReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant