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Stock-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Jul. 26, 2014
Jul. 27, 2013
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]    
Equity-based awards expense $ 3,010 $ 3,193
Liability-based awards expense (income) (448) 1,904
Total stock-based compensation expense $ 2,562 $ 5,097
Employee and Directors Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted (in shares) 373,711  
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares/units granted (in shares) 92,161  
Performance-Based Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares/units granted (in shares) 191,783