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Associate Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		4 Months Ended	9 Months Ended
	Jul. 01, 2022	Oct. 08, 2022	Oct. 09, 2021	Apr. 23, 2022	Oct. 08, 2022	Oct. 09, 2021
Defined Benefit Plan Disclosure [Line Items]
Gain realized related to refund				$ 0.2
Pension contributions during last plan year		$ 2.2	$ 2.2		$ 9.1	$ 10.3
Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense		0.8			0.9
Defined Benefit Plan Employer Contributions Current Fiscal Year		0.2			0.2
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		$ 0.7	$ 0.2		$ 0.2	$ 0.5

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- Definition

Defined Benefit Plan Employer Contributions Current Fiscal Year

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Payment To Retired Participants

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

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-Name Accounting Standards Codification
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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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