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Associate Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions			4 Months Ended
	Jun. 28, 2024	Jun. 30, 2022	Apr. 19, 2025	Apr. 20, 2024
Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense				$ 0.9
Increase (Decrease) in obligations		$ 6.6
SpartanNash Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense	$ 0.1			0.9
Payment to retired participants	$ 1.3
Central States, Southeast and Southwest Areas Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contributions during last plan year			$ 4.3	$ 4.6

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- Definition

Payment To Retired Participants

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

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- Definition

Amount of increase (decrease) in obligation for pension and other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans.

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Amount of contribution received by multiemployer pension plan from all employers participating in multiemployer pension plan determined to be individually significant.

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