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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
Jan. 31, 2017
Apr. 30, 2016
Jan. 31, 2016
Apr. 30, 2015
Investment Holdings [Line Items]        
Cash and cash equivalents $ 351,305 $ 273,252 $ 207,342 $ 380,838
Marketable Securities, Current 4,139 11,338    
Marketable securities, non-current 111,289 130,092    
Other Accrued Liabilities (150,009) (145,023)    
Fair Value, Inputs, Level 1        
Investment Holdings [Line Items]        
Cost 463,837 415,840    
Unrealized Gains 4,479 1,395    
Unrealized Losses (1,583) (2,553)    
Fair Value 466,733 414,682    
Cash and cash equivalents 351,305 273,252    
Marketable Securities, Current 4,139 11,338    
Marketable securities, non-current 111,289 130,092    
Fair Value, Inputs, Level 1 | Cash        
Investment Holdings [Line Items]        
Cash and cash equivalents 154,462 155,702    
Cost 154,462 155,702    
Fair Value 154,462 155,702    
Fair Value, Inputs, Level 1 | Money Market Funds        
Investment Holdings [Line Items]        
Cash and cash equivalents 196,843 117,550    
Fair Value 196,843 117,550    
Cost 196,843 117,550    
Fair Value, Inputs, Level 1 | Mutual Funds        
Investment Holdings [Line Items]        
Unrealized Gains [1] 4,479 1,395    
Unrealized Losses [1] (1,583) (2,553)    
Marketable Securities, Current [1] 4,139 11,338    
Marketable securities, non-current [1] 111,289 130,092    
Cost [1] 112,532 142,588    
Fair Value [1] 115,428 141,430    
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts        
Investment Holdings [Line Items]        
Unrealized Gains 338 324    
Unrealized Losses (902) (1,041)    
Fair Value (564) (717)    
Other Accrued Liabilities $ (564) $ (717)    
[1] These investments are held in trust for settlement of the Company's vested and unvested obligations of $135.6 million and $138.8 million as of January 31, 2017 and April 30, 2016, respectively, under the ECAP (see Note 7 - Deferred Compensation and Retirement Plans). During the three and nine months ended January 31, 2017, the fair value of the investments increased; therefore, the Company recognized income of $3.9 million and $7.1 million, respectively, which was recorded in other income (loss), net. During the three and nine months ended January 31, 2016, the fair value of the investments decreased; therefore, the Company recognized a loss of $7.1 million and $8.9 million, respectively, which was recorded in other income (loss), net.