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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($)
$ in Thousands
Jan. 31, 2021
Apr. 30, 2020
Investment Holdings [Line Items]    
Cash and cash equivalents $ 694,128 $ 689,244
Marketable Securities, Current 45,931 41,951
Marketable securities, non-current 157,023 132,134
Income Taxes & Other Receivables 483 2,634
Fair Value 897,565 865,963
Fair Value, Inputs, Level 1 | Money Market Funds    
Investment Holdings [Line Items]    
Cash and cash equivalents 88,995 71,763
Fair Value 88,995 71,763
Fair Value, Inputs, Level 1 | Mutual Funds    
Investment Holdings [Line Items]    
Marketable Securities, Current [1] 7,577 9,278
Marketable securities, non-current [1] 157,023 132,134
Fair Value [1] 164,600 141,412
Fair Value, Inputs, Level 1 | Equity Securities    
Investment Holdings [Line Items]    
Marketable Securities, Current 7,577 9,278
Marketable securities, non-current 157,023 132,134
Fair Value 164,600 141,412
Fair Value, Inputs, Level 1 | Cash    
Investment Holdings [Line Items]    
Cash and cash equivalents 603,382 611,795
Fair Value 603,382 611,795
Fair Value, Inputs, Level 2    
Investment Holdings [Line Items]    
Cost 40,112 38,313
Unrealized Gains 2 65
Unrealized Losses (9) (19)
Fair Value 40,105 38,359
Cash and cash equivalents 1,751 5,686
Marketable Securities, Current 38,354 32,673
Fair Value, Inputs, Level 2 | Commercial Paper    
Investment Holdings [Line Items]    
Cost 23,087 19,132
Unrealized Gains 1 39
Unrealized Losses (2)  
Fair Value 23,086 19,171
Cash and cash equivalents   4,785
Marketable Securities, Current 23,086 14,386
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds    
Investment Holdings [Line Items]    
Cost 15,050 19,181
Unrealized Gains   26
Unrealized Losses (7) (19)
Fair Value 15,043 19,188
Cash and cash equivalents 1,751 901
Marketable Securities, Current 13,292 18,287
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities    
Investment Holdings [Line Items]    
Cost 1,975  
Unrealized Gains 1  
Fair Value 1,976  
Marketable Securities, Current 1,976  
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts    
Investment Holdings [Line Items]    
Income Taxes & Other Receivables 483 2,634
Fair Value $ 483 $ 2,634
[1] These investments are held in trust for settlement of the Company’s vested obligations of $147.1 million and $124.6 million as of January 31, 2021 and April 30, 2020, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $25.4 million and $21.7 million as of January 31, 2021 and April 30, 2020, respectively. During the three and nine months ended January 31, 2021, the fair value of the investments increased; therefore, the Company recognized a gain of $15.2 million and $27.2 million, respectively, which was recorded in other income, net. 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.