Associate Retirement Plans - Additional Information (Detail) - USD ($)	4 Months Ended
	Apr. 22, 2017	Apr. 23, 2016
SpartanNash Company Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense	$ (200,000)
Standard pension funding carryover	0
Expected Company contribution for remainder of fiscal year	0
SpartanNash Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense	100,000
Central States, Southeast and Southwest Areas Pension Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contributions during last plan year	$ 4,400,000	$ 4,200,000