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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($)
$ in Thousands
Jan. 31, 2020
Apr. 30, 2019
Investment Holdings [Line Items]    
Cash and cash equivalents $ 563,708 $ 626,360
Marketable Securities, Current 41,022 8,288
Marketable securities, non-current 143,789 132,463
Income Taxes & Other Receivables 38,656 26,767
Fair Value, Inputs, Level 1    
Investment Holdings [Line Items]    
Cost 701,103 761,799
Unrealized Gains 8,366 6,301
Unrealized Losses (662) (989)
Fair Value 708,807 767,111
Cash and cash equivalents 557,218 626,360
Marketable Securities, Current 7,800 8,288
Marketable securities, non-current 143,789 132,463
Fair Value, Inputs, Level 1 | Cash    
Investment Holdings [Line Items]    
Cost 506,816 579,998
Fair Value 506,816 579,998
Cash and cash equivalents 506,816 579,998
Fair Value, Inputs, Level 1 | Money Market Funds    
Investment Holdings [Line Items]    
Cost 50,402 46,362
Fair Value 50,402 46,362
Cash and cash equivalents 50,402 46,362
Fair Value, Inputs, Level 1 | Mutual Funds    
Investment Holdings [Line Items]    
Cost [1] 143,885 135,439
Unrealized Gains [1] 8,366 6,301
Unrealized Losses [1] (662) (989)
Fair Value [1] 151,589 140,751
Marketable Securities, Current [1] 7,800 8,288
Marketable securities, non-current [1] 143,789 132,463
Fair Value, Inputs, Level 2    
Investment Holdings [Line Items]    
Cost 39,719  
Unrealized Gains 1  
Unrealized Losses (8)  
Fair Value 39,712  
Cash and cash equivalents 6,490  
Marketable Securities, Current 33,222  
Fair Value, Inputs, Level 2 | Commercial Paper    
Investment Holdings [Line Items]    
Cost 19,281  
Unrealized Losses (2)  
Fair Value 19,279  
Cash and cash equivalents 2,793  
Marketable Securities, Current 16,486  
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds    
Investment Holdings [Line Items]    
Cost 20,438  
Unrealized Gains 1  
Unrealized Losses (6)  
Fair Value 20,433  
Cash and cash equivalents 3,697  
Marketable Securities, Current 16,736  
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts    
Investment Holdings [Line Items]    
Unrealized Gains 751 821
Unrealized Losses (629) (722)
Fair Value 122 99
Income Taxes & Other Receivables $ 122 99
Fair Value, Inputs, Level 2 | Interest Rate Swap    
Investment Holdings [Line Items]    
Fair Value   619
Income Taxes & Other Receivables   619
Unrealized Gains   $ 619
[1] These investments are held in trust for settlement of the Company’s vested obligations of $135.7 million and $122.3 million as of January 31, 2020 and April 30, 2019, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $23.2 million and $24.6 million as of January 31, 2020 and April 30, 2019, respectively. During the three and nine months ended January 31, 2020, the fair value of the investments increased; therefore, the Company recognized a gain of $5.2 million and $8.3 million, respectively, which was recorded in other income, net. 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.