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Cash, Trading Securities and Foreign Currency Forward Contracts' Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value Recorded as Cash and Cash Equivalents, Current Portion of Current Marketable Securities, Non-Current Marketable Securities, or Other Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Jul. 31, 2016
Apr. 30, 2016
Jul. 31, 2015
Apr. 30, 2015
Investment Holdings [Line Items]        
Cash and cash equivalents $ 244,073 $ 273,252 $ 276,514 $ 380,838
Marketable Securities, Current 3,475 11,338    
Marketable securities, non-current 133,502 130,092    
Other Accrued Liabilities (149,865) (145,023)    
Fair Value, Inputs, Level 1        
Investment Holdings [Line Items]        
Cost 378,520 415,840    
Unrealized Gains 3,477 1,395    
Unrealized Losses (947) (2,553)    
Fair Value 381,050 414,682    
Cash and cash equivalents 244,073 273,252    
Marketable Securities, Current 3,475 11,338    
Marketable securities, non-current 133,502 130,092    
Fair Value, Inputs, Level 1 | Cash        
Investment Holdings [Line Items]        
Cash and cash equivalents 119,660 155,702    
Cost 119,660 155,702    
Fair Value 119,660 155,702    
Fair Value, Inputs, Level 1 | Money Market Funds        
Investment Holdings [Line Items]        
Cash and cash equivalents 124,413 117,550    
Fair Value 124,413 117,550    
Cost 124,413 117,550    
Fair Value, Inputs, Level 1 | Mutual Funds        
Investment Holdings [Line Items]        
Unrealized Gains [1] 3,477 1,395    
Unrealized Losses [1] (947) (2,553)    
Marketable Securities, Current [1] 3,475 11,338    
Marketable securities, non-current [1] 133,502 130,092    
Cost [1] 134,447 142,588    
Fair Value [1] 136,977 141,430    
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts        
Investment Holdings [Line Items]        
Unrealized Gains 419 324    
Unrealized Losses (966) (1,041)    
Fair Value (547) (717)    
Other Accrued Liabilities $ (547) $ (717)    
[1] These investments are held in trust for settlement of the Company's vested and unvested obligations of $133.9 million and $138.8 million as of July 31, 2016 and April 30, 2016, respectively, under the ECAP (see Note 7 - Deferred Compensation and Retirement Plans). During the three months ended July 31, 2016 and 2015, the fair value of the investments increased; therefore, the Company recognized income of $3.9 million and $0.7 million, respectively, which was recorded in other income (loss), net.