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Document and Entity Information - USD ($)
 6 Months Ended
Jun. 26, 2015
Jul. 15, 2015
Document Information [Abstract]    
Document type 10-Q  
Document period end date Jun. 26, 2015  
Amendment flag false  
Entity Information [Abstract]    
Entity registrant name Graco Inc.  
Entity central index key 0000042888  
Entity current reporting status Yes  
Entity voluntary filers No  
Current fiscal year end date --12-25  
Entity filer category Large Accelerated Filer  
Entity well known seasoned issuer Yes  
Entity common stock shares outstanding   57,729,000
Entity public float $ 4,128,441,586  
Document fiscal year focus 2015  
Document fiscal period focus Q2  
Trading Symbol GGG