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Document and Entity Information
 4 Months Ended
Apr. 25, 2015
May 26, 2015
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Apr. 25, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Trading Symbol SPTN  
Entity Registrant Name SPARTANNASH COMPANY  
Entity Central Index Key 0000877422  
Current Fiscal Year End Date --01-02  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   37,610,923dei_EntityCommonStockSharesOutstanding