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Summary of Significant Accounting Policies and Basis of Presentation - Summary of Changes in SpartanNash's Self-Insurance Liability (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Payables And Accruals [Abstract]      
Balance at beginning of year $ 14,730 $ 14,466 $ 19,413
Expenses 54,748 49,560 43,851
Claim payments, net of employee contributions (54,323) (49,296) (48,798)
Balance at end of year $ 15,155 $ 14,730 $ 14,466