Associate Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions				3 Months Ended		6 Months Ended
	Jun. 28, 2024	Jul. 01, 2023	Jun. 30, 2022	Jul. 13, 2024	Jul. 15, 2023	Jul. 13, 2024	Jul. 15, 2023
Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense				$ 0.7	$ 0.8	$ 1.7	$ 1.8
Increase (Decrease) in obligations			$ 6.6
SpartanNash Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense	$ 0.1	$ 0.3		0.5	0.6	1.4	1.5
Payment to retired participants	$ 1.3	$ 1.3
Central States, Southeast and Southwest Areas Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contributions during last plan year				$ 3.3	$ 3.3	$ 7.9	$ 7.6