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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($)
$ in Thousands
Jan. 31, 2019
Apr. 30, 2018
Jan. 31, 2018
Apr. 30, 2017
Investment Holdings [Line Items]        
Cash and cash equivalents $ 489,509 $ 520,848 $ 389,990 $ 410,882
Marketable Securities, Current 6,414 14,293    
Marketable securities, non-current 126,950 122,792    
Income Taxes & Other Receivables 29,502 29,089    
Fair Value, Inputs, Level 1        
Investment Holdings [Line Items]        
Cost 623,366 647,925    
Unrealized Gains 3,392 11,040    
Unrealized Losses (3,885) (1,032)    
Fair Value 622,873 657,933    
Cash and cash equivalents 489,509 520,848    
Marketable Securities, Current 6,414 14,293    
Marketable securities, non-current 126,950 122,792    
Fair Value, Inputs, Level 1 | Cash        
Investment Holdings [Line Items]        
Cost 468,275 519,818    
Fair Value 468,275 519,818    
Cash and cash equivalents 468,275 519,818    
Fair Value, Inputs, Level 1 | Money Market Funds        
Investment Holdings [Line Items]        
Cost 21,234 1,030    
Fair Value 21,234 1,030    
Cash and cash equivalents 21,234 1,030    
Fair Value, Inputs, Level 1 | Mutual Funds        
Investment Holdings [Line Items]        
Cost [1] 133,857 127,077    
Unrealized Gains [1] 3,392 11,040    
Unrealized Losses [1] (3,885) (1,032)    
Fair Value [1] 133,364 137,085    
Marketable Securities, Current [1] 6,414 14,293    
Marketable securities, non-current [1] 126,950 122,792    
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts        
Investment Holdings [Line Items]        
Unrealized Gains 1,633 1,778    
Unrealized Losses (683) (1,025)    
Fair Value 950 753    
Income Taxes & Other Receivables 950 753    
Fair Value, Inputs, Level 2 | Interest Rate Swap        
Investment Holdings [Line Items]        
Fair Value 1,128 2,076    
Income Taxes & Other Receivables 1,128 2,076    
Unrealized Gains $ 1,128 $ 2,076    
[1] These investments are held in trust for settlement of the Company’s vested obligations of $116.2 million and $118.2 million as of January 31, 2019 and April 30, 2018, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $23.8 million and $29.5 million as of January 31, 2019 and April 30, 2018, respectively. During the three and nine months ended January 31, 2019, the fair value of the investments increased; therefore, the Company recognized a gain of $2.2 million and $1.3 million, respectively, which was recorded in other income, net. During the three and nine months ended January 31, 2018, the fair value of the investments increased; therefore, the Company recognized income of $7.2 million and $14.0 million, respectively, which was recorded in other income, net.