Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Apr. 28, 2018
Jun. 12, 2018
Oct. 28, 2017
Document and Entity Information      
Entity Registrant Name LA-Z-BOY INC    
Entity Central Index Key 0000057131    
Current Fiscal Year End Date --04-28    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 1,316.9
Entity Common Stock, Shares Outstanding   46,638,907  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Apr. 28, 2018