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Product Warranties (Details) (USD $)
3 Months Ended 6 Months Ended
Oct. 26, 2013
Oct. 27, 2012
Oct. 26, 2013
Oct. 27, 2012
Apr. 27, 2013
Product Warranty Contingency [Line Items]          
Percentage of warranty liability relating to Upholstery Group (in hundredths)     90.00%    
Reconciliation of changes in product warranty liability [Roll Forward]          
Balance as of the beginning of the period $ 15,821,000 $ 14,319,000 $ 15,525,000 $ 14,327,000  
Accruals during the period 3,884,000 3,518,000 7,672,000 6,908,000  
Settlements during the period (3,776,000) (3,524,000) (7,268,000) (6,922,000)  
Balance as of the end of the period 15,929,000 14,313,000 15,929,000 14,313,000  
Amount of product warranty liability included in accrued expenses and other current liabilities $ 9,900,000   $ 9,900,000   $ 9,500,000
Fabric and Leather [Member]
         
Product Warranty Contingency [Line Items]          
Warranty term     1 year    
Padding [Member]
         
Product Warranty Contingency [Line Items]          
Warranty term     1 to 10 years    
Certain Mechanisms and Frames [Member]
         
Product Warranty Contingency [Line Items]          
Warranty term     Up to a lifetime    
Labor Costs Relating to Parts [Member]
         
Product Warranty Contingency [Line Items]          
Warranty term     1 year