Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Financial Instruments and Balance Sheet Classifications (Detail)

v3.21.2
Financial Instruments - Financial Instruments and Balance Sheet Classifications (Detail) - USD ($)
$ in Thousands
Jul. 31, 2021
Apr. 30, 2021
Investment Holdings [Line Items]    
Cash and cash equivalents $ 649,304 $ 850,778
Marketable Securities, Current 68,247 63,667
Marketable securities, non-current 186,735 182,692
Other Accrued Liabilities (203) (12)
Fair Value 904,083 1,097,125
Fair Value, Inputs, Level 2    
Investment Holdings [Line Items]    
Cost 73,914 80,325
Unrealized Gains 4 1
Unrealized Losses (25) (27)
Fair Value 73,893 80,299
Cash and cash equivalents   9,499
Marketable Securities, Current 58,497 54,583
Marketable securities, non-current 15,396 16,217
Fair Value, Inputs, Level 2 | Commercial Paper    
Investment Holdings [Line Items]    
Cost 35,925 51,979
Unrealized Gains 2 1
Unrealized Losses (6) (7)
Fair Value 35,921 51,973
Cash and cash equivalents   9,499
Marketable Securities, Current 35,921 42,474
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds    
Investment Holdings [Line Items]    
Cost 36,014 26,371
Unrealized Gains 2  
Unrealized Losses (19) (20)
Fair Value 35,997 26,351
Marketable Securities, Current 20,601 10,134
Marketable securities, non-current 15,396 16,217
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities    
Investment Holdings [Line Items]    
Cost 1,975 1,975
Fair Value 1,975 1,975
Marketable Securities, Current 1,975 1,975
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts    
Investment Holdings [Line Items]    
Other Accrued Liabilities (203) (12)
Fair Value (203) (12)
Fair Value, Inputs, Level 1 | Mutual Funds    
Investment Holdings [Line Items]    
Marketable Securities, Current [1] 9,750 9,084
Marketable securities, non-current [1] 171,339 166,475
Fair Value [1] 181,089 175,559
Fair Value, Inputs, Level 1 | Equity Securities    
Investment Holdings [Line Items]    
Marketable Securities, Current 9,750 9,084
Marketable securities, non-current 171,339 166,475
Fair Value 181,089 175,559
Fair Value, Inputs, Level 1 | Cash    
Investment Holdings [Line Items]    
Cash and cash equivalents 554,698 752,737
Fair Value 554,698 752,737
Fair Value, Inputs, Level 1 | Money Market Funds    
Investment Holdings [Line Items]    
Cash and cash equivalents 94,606 88,542
Fair Value $ 94,606 $ 88,542
[1] These investments are held in trust for settlement of the Company’s vested obligations of $171.2 million and $157.3 million as of July 31, 2021 and April 30, 2021, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $24.7 million and $26.5 million as of July 31, 2021 and April 30, 2021, respectively. During the three months ended July 31, 2021 and 2020, the fair value of the investments increased; therefore, the Company recognized a gain of $5.2 million and $11.5 million, respectively, which was recorded in other income, net.