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Associate Retirement Plans - Components of Net Periodic Pension and Postretirement Benefit Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 04, 2014
Oct. 12, 2013
Oct. 04, 2014
Oct. 12, 2013
Cash Balance Pension Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 556 $ 517 $ 1,854 $ 1,804
Expected return on plan assets (867) (944) (2,891) (3,241)
Recognized actuarial net loss 228 300 761 995
Net periodic income (83) (127) (276) (442)
Settlement expense 261   783  
Total expense (income) 178 (127) 507 (442)
Super Foods Pension Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 461   1,536  
Expected return on plan assets (532)   (1,773)  
Net periodic income (71)   (237)  
Total expense (income) (71)   (237)  
SERP [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 8 8 27 28
Recognized actuarial net loss 7 6 23 22
Total expense (income) 15 14 50 50
Spartan Stores Medical Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 44 59 144 183
Interest cost 91 89 303 300
Amortization of prior service cost (37) (13) (122) (42)
Recognized actuarial net loss 4 41 15 127
Total expense (income) $ 102 $ 176 $ 340 $ 568