Associate Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	4 Months Ended
	Apr. 23, 2022	Apr. 24, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension contributions during last plan year	$ 3.8	$ 4.6
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense		0.2
Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected Company contribution for remainder of fiscal year	0.5
Standard pension funding carryover	0.1
SpartanNash Retiree Medical Plan Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense	$ 0.2	$ 0.2