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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($)
$ in Thousands
Oct. 31, 2017
Apr. 30, 2017
Oct. 31, 2016
Apr. 30, 2016
Investment Holdings [Line Items]        
Other Accrued Liabilities $ (150,855) $ (148,464)    
Cash and cash equivalents 282,625 410,882 $ 250,033 $ 273,252
Marketable Securities, Current 13,671 4,363    
Marketable securities, non-current 117,566 115,574    
Income Taxes & Other Receivables 40,312 31,573    
Fair Value, Inputs, Level 1        
Investment Holdings [Line Items]        
Cost 402,244 524,700    
Unrealized Gains 12,089 6,697    
Unrealized Losses (471) (578)    
Fair Value 413,862 530,819    
Cash and cash equivalents 282,625 410,882    
Marketable Securities, Current 13,671 4,363    
Marketable securities, non-current 117,566 115,574    
Fair Value, Inputs, Level 1 | Cash        
Investment Holdings [Line Items]        
Cash and cash equivalents 281,605 409,824    
Cost 281,605 409,824    
Fair Value 281,605 409,824    
Fair Value, Inputs, Level 1 | Money Market Funds        
Investment Holdings [Line Items]        
Cash and cash equivalents 1,020 1,058    
Fair Value 1,020 1,058    
Cost 1,020 1,058    
Fair Value, Inputs, Level 1 | Mutual Funds        
Investment Holdings [Line Items]        
Unrealized Gains [1] 12,089 6,697    
Unrealized Losses [1] (471) (578)    
Marketable Securities, Current [1] 13,671 4,363    
Marketable securities, non-current [1] 117,566 115,574    
Cost [1] 119,619 113,818    
Fair Value [1] 131,237 119,937    
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts        
Investment Holdings [Line Items]        
Other Accrued Liabilities (601) (717)    
Unrealized Gains 1,528 129    
Unrealized Losses (1,075) (846)    
Fair Value 453 (717)    
Income Taxes & Other Receivables 1,054      
Fair Value, Inputs, Level 2 | Interest Rate Swap        
Investment Holdings [Line Items]        
Unrealized Losses (303) (947)    
Fair Value (303) (947)    
Other Accrued Liabilities $ (303) $ (947)    
[1] These investments are held in trust for settlement of the Company's vested obligations of $116.2 million and $99.5 million as of July 31, 2017 and April 30, 2017, respectively, under the ECAP (see Note 7 - Deferred Compensation and Retirement Plans). During the three months ended July 31, 2017 and 2016, the fair value of the investments increased; therefore, the Company recognized income of $3.4 million and $3.9 million, respectively, which was recorded in other income, net.