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Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 25, 2020
Jan. 26, 2019
Jan. 25, 2020
Jan. 26, 2019
Apr. 27, 2019
Reconciliation of changes in product warranty liability          
Balance as of the beginning of the period $ 23,081 $ 25,197 $ 22,736 $ 21,205  
Acquisitions 0 0 0 4,100  
Accruals during the period 6,321 5,660 17,746 16,270  
Settlements during the period (6,057) (5,560) (17,137) (16,278)  
Balance as of the end of the period 23,345 $ 25,297 23,345 $ 25,297  
Product warranty liability accrued $ 14,300   $ 14,300   $ 13,900
Minimum | Upholstery          
Product Warranties          
Percentage of warranty liability relating to the segment     90.00%    
Fabric and leather | Upholstery          
Product Warranties          
Warranty term (in years)     1 year    
Cushions and padding | Minimum | Upholstery          
Product Warranties          
Warranty term (in years)     1 year    
Cushions and padding | Maximum | Upholstery          
Product Warranties          
Warranty term (in years)     10 years    
Labor costs relating to parts | Upholstery          
Product Warranties          
Warranty term (in years)     1 year