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Associate Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions		4 Months Ended
	Jul. 01, 2022	Apr. 22, 2023	Apr. 23, 2022
Defined Benefit Plan Disclosure [Line Items]
Gain realized related to refund		$ 0.2
Pension contributions during last plan year		4.3	$ 3.8
Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense		1.0
Increase (Decrease) in obligations		6.6
SpartanNash Retiree Medical Plan Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense	$ 0.7
Payment to retired participants	$ 2.0
SpartanNash Retiree Medical Plan Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense		$ 0.9	$ 0.2

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

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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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