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Associate Retirement Plans - Schedule of Benefit Obligations, Pension & Postretirement Benefit Plans (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Dec. 28, 2013
Jan. 02, 2016
Jan. 03, 2015
Benefit Obligation      
Benefit obligation at beginning of year   $ 93,000  
Benefit obligation at end of year   83,400 $ 93,000
Fair value of plan assets:      
Balance at beginning of year   93,718  
Plan assets at fair value at end of year   84,753 93,718
Components of net amount recognized in financial position:      
Noncurrent liabilities   (16,008) (23,701)
SpartanNash Company Pension Plan [Member]      
Benefit Obligation      
Projected Benefit Obligation Beginning of the year   93,034 102,501
Interest cost $ 1,916 3,325 4,223
Actuarial (gain) loss   (4,985) 5,959
Benefits paid   (7,976) (19,649)
Projected Benefit Obligation Ending of the year 102,501 83,398 93,034
Fair value of plan assets:      
Balance at beginning of year   93,718 105,949
Actual return on plan assets   (1,639) 5,093
Company contributions   650 2,325
Benefits paid   (7,976) (19,649)
Plan assets at fair value at end of year 105,949 84,753 93,718
Funded (unfunded) status   1,355 684
Components of net amount recognized in financial position:      
Noncurrent assets   1,355 7,220
Noncurrent liabilities     (6,536)
Net asset/(liability)   1,355 684
Amounts recognized in accumulated other comprehensive income:      
Net actuarial loss   17,322 16,572
Total   $ 17,322 $ 16,572
Weighted average assumptions at measurement date:      
Discount rate   4.04%  
Expected return on plan assets   5.05% 5.50%
SpartanNash Medical Plan [Member]      
Benefit Obligation      
Projected Benefit Obligation Beginning of the year   $ 9,905 $ 7,967
Service cost 194 231 186
Interest cost 287 404 394
Actuarial (gain) loss   (1,117) 1,593
Benefits paid   (244) (235)
Projected Benefit Obligation Ending of the year $ 7,967 9,179 9,905
Fair value of plan assets:      
Company contributions   244 235
Benefits paid   (244) (235)
Funded (unfunded) status   (9,179) (9,905)
Components of net amount recognized in financial position:      
Current liabilities   (340) (319)
Noncurrent liabilities   (8,839) (9,586)
Net asset/(liability)   (9,179) (9,905)
Amounts recognized in accumulated other comprehensive income:      
Net actuarial loss   1,263 2,554
Prior service credit   (566) (724)
Total   $ 697 $ 1,830
Weighted average assumptions at measurement date:      
Discount rate   4.55% 4.15%
Minimum [Member] | SpartanNash Company Pension Plan [Member]      
Weighted average assumptions at measurement date:      
Discount rate     3.60%
Maximum [Member] | SpartanNash Company Pension Plan [Member]      
Weighted average assumptions at measurement date:      
Discount rate     3.85%