Associate Retirement Plans - Additional Information (Detail) - USD ($)		3 Months Ended		4 Months Ended	6 Months Ended
	Jul. 01, 2022	Jul. 16, 2022	Jul. 17, 2021	Apr. 23, 2022	Jul. 16, 2022	Jul. 17, 2021
Defined Benefit Plan Disclosure [Line Items]
Gain realized related to refund				$ 200,000
Pension contributions during last plan year		$ 3,100,000	$ 3,400,000		$ 6,900,000	$ 8,000,000.0
Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense		100,000
Defined Benefit Plan Employer Contributions Current Fiscal Year		200,000			200,000
Increase (Decrease) in obligations					6,600,000
SpartanNash Retiree Medical Plan Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense	$ 700,000
Payment to retired participants	$ 2,000,000.0
SpartanNash Retiree Medical Plan Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense		$ 700,000	$ 100,000		$ 900	$ 300,000