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Associate Retirement Plans - Components of Net Periodic Pension and Postretirement Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 18, 2015
Jul. 12, 2014
Jul. 18, 2015
Jul. 12, 2014
SpartanNash Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 767   $ 1,791  
Expected return on plan assets (1,136)   (2,651)  
Recognized actuarial net loss 191   445  
Net periodic benefit (178)   (415)  
Settlement expense 131   306  
Total expense (income) (47)   (109)  
Combined SpartanNash Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   $ 1,018   $ 2,373
Expected return on plan assets   (1,400)   (3,265)
Recognized actuarial net loss   228   533
Net periodic benefit   (154)   (359)
Settlement expense   522   522
Total expense (income)   368   163
Cash Balance Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   557   1,298
Expected return on plan assets   (868)   (2,024)
Recognized actuarial net loss   228   533
Net periodic benefit   (83)   (193)
Settlement expense   522   522
Total expense (income)   439   329
Super Foods Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   461   1,075
Expected return on plan assets   (532)   (1,241)
Net periodic benefit   (71)   (166)
Total expense (income)   (71)   (166)
SERP [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 7 8 17 19
Recognized actuarial net loss 10 7 22 16
Net periodic benefit 17 15 39 35
Spartan Stores Medical Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 53 43 124 100
Interest cost 93 91 218 212
Amortization of prior service cost (36) (37) (85) (85)
Recognized actuarial net loss 40 5 93 11
Net periodic benefit $ 150 $ 102 $ 350 $ 238