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Fair Value of Financial Instruments (Details 1) - USD ($) $ in Thousands | Oct. 31, 2021 | Jul. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 1,042,561 | $ 1,201,932
Unrealized Gains | 387 | 739
Unrealized Losses | (745) | (47)
Estimated Fair Value | 1,042,203 | 1,202,624
U.S. Government agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 37,672 | 85,165
Unrealized Gains | 1 | 15
Unrealized Losses | (71) | 0
Estimated Fair Value | 37,602 | 85,180
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 327,355 | 389,837
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 327,355 | 389,837
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 372,970 | 371,374
Unrealized Gains | 335 | 623
Unrealized Losses | (422) | (37)
Estimated Fair Value | 372,883 | 371,960
U.S. Government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 62,321 | 64,401
Unrealized Gains | 36 | 62
Unrealized Losses | (192) | (1)
Estimated Fair Value | 62,165 | 64,462
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 48,778 | 47,925
Unrealized Gains | 8 | 29
Unrealized Losses | (33) | (7)
Estimated Fair Value | 48,753 | 47,947
Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 43,586 | 33,177
Unrealized Gains | 7 | 10
Unrealized Losses | (27) | (2)
Estimated Fair Value | 43,566 | 33,185
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 205 | 1,685
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 205 | 1,685
Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 82,151 | 82,250
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 82,151 | 82,250
Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 66,523 | 125,118
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 66,523 | 125,118
Strategic convertible debt investment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 1,000 | 1,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | $ 1,000 | $ 1,000

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