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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 25, 2014
Apr. 27, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 211,424 $ 282,619
Derivative instruments, assets 2,165 486
Total assets 213,589 283,105
Derivative instruments, liabilities 2,172 509
Quoted Prices in Active Markets (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 211,424 282,619
Total assets 211,424 282,619
Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instruments, assets 2,165 486
Total assets 2,165 486
Derivative instruments, liabilities 2,172 509
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets     
Derivative instruments, liabilities