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Document and Entity Information - shares
 6 Months Ended
Jul. 13, 2019
Aug. 19, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 13, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Trading Symbol SPTN  
Entity Registrant Name SPARTANNASH COMPANY  
Entity Central Index Key 0000877422  
Current Fiscal Year End Date --12-28  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   36,334,477
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity File Number 000-31127  
Entity Tax Identification Number 380593940  
Entity Address, Address Line One 850 76th Street, S.W.  
Entity Address, Address Line Two P.O. Box 8700  
Entity Address, City or Town Grand Rapids  
Entity Address, State or Province Michigan  
Entity Address, Postal Zip Code 49518  
City Area Code 616  
Local Phone Number 878-2000