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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2023
Oct. 31, 2022
Apr. 30, 2023
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Assets, fair value $ 842,385   $ 842,385   $ 1,070,034
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 620,836   620,836   844,024
Marketable Securities, Current 26,149   26,149   44,837
Marketable Securities, Non- current 196,860   196,860   179,040
Other Accrued Liabilities (1,460)   (1,460)    
Income Taxes & Other Receivables         2,133
Obligations for which assets are held in trust 177,800   177,800   172,200
Unvested obligations under deferred compensation plans 21,400   21,400   21,900
Decrease in the fair value of marketable securities 13,800 $ 9,700 1,000 $ 9,700  
Fair Value, Inputs, Level 2          
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Cost 37,979   37,979    
Unrealized Gains 0   0    
Unrealized Losses (155)   (155)    
Debt securities AFS, fair value 37,824   37,824    
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 8,188   8,188    
Marketable Securities, Current 16,097   16,097    
Marketable Securities, Non- current 13,539   13,539    
Other Accrued Liabilities 0   0    
Fair Value, Inputs, Level 2 | Foreign currency forward contracts          
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Foreign currency forward contracts, fair value (1,460)   (1,460)   2,133
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 0   0   0
Marketable Securities, Current 0   0   0
Marketable Securities, Non- current 0   0   0
Other Accrued Liabilities (1,460)   (1,460)    
Income Taxes & Other Receivables         2,133
Fair Value, Inputs, Level 2 | Commercial paper          
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Cost 8,264   8,264   11,751
Unrealized Gains 0   0   0
Unrealized Losses (5)   (5)   (30)
Debt securities AFS, fair value 8,259   8,259   11,721
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 3,889   3,889   0
Marketable Securities, Current 4,370   4,370   11,721
Marketable Securities, Non- current 0   0   0
Other Accrued Liabilities 0   0    
Income Taxes & Other Receivables         0
Fair Value, Inputs, Level 2 | Corporate notes/bonds          
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Cost 21,622   21,622   24,754
Unrealized Gains 0   0   0
Unrealized Losses (136)   (136)   (355)
Debt securities AFS, fair value 21,486   21,486   24,399
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 0   0   0
Marketable Securities, Current 11,727   11,727   21,492
Marketable Securities, Non- current 9,759   9,759   2,907
Other Accrued Liabilities 0   0    
Income Taxes & Other Receivables         0
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities          
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Cost 8,093   8,093   36,505
Unrealized Gains 0   0   0
Unrealized Losses (14)   (14)   (385)
Debt securities AFS, fair value 8,079   8,079   36,120
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 4,299   4,299   0
Marketable Securities, Current 0   0   33,213
Marketable Securities, Non- current 3,780   3,780   2,907
Other Accrued Liabilities 0   0    
Income Taxes & Other Receivables         0
Fair Value, Inputs, Level 1 | Mutual funds          
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Equity securities, fair value 193,373   193,373   187,757
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 0   0   0
Marketable Securities, Current 10,052   10,052   11,624
Marketable Securities, Non- current 183,321   183,321   176,133
Other Accrued Liabilities 0   0    
Income Taxes & Other Receivables         0
Fair Value, Inputs, Level 1 | Equity investments          
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Equity securities, fair value 193,373   193,373   187,757
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 0   0   0
Marketable Securities, Current 10,052   10,052   11,624
Marketable Securities, Non- current 183,321   183,321   176,133
Other Accrued Liabilities 0   0    
Income Taxes & Other Receivables         0
Fair Value, Inputs, Level 1 | Cash          
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Cash and cash equivalents, fair value 499,666   499,666   696,180
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 499,666   499,666   696,180
Marketable Securities, Current 0   0   0
Marketable Securities, Non- current 0   0   0
Other Accrued Liabilities 0   0    
Income Taxes & Other Receivables         0
Fair Value, Inputs, Level 1 | Money market funds          
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]          
Cash and cash equivalents, fair value 112,982   112,982   147,844
Balance Sheet Related Disclosures [Abstract]          
Cash and Cash Equivalents 112,982   112,982   147,844
Marketable Securities, Current 0   0   0
Marketable Securities, Non- current 0   0   0
Other Accrued Liabilities $ 0   $ 0    
Income Taxes & Other Receivables         $ 0