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Fair Value of Financial Instruments (Details 1) - USD ($) $ in Thousands | Oct. 31, 2022 | Jul. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 780,848 | $ 1,066,361
Unrealized Gains | 15 | 8
Unrealized Losses | (9,617) | (7,750)
Estimated Fair Value | 771,246 | 1,058,619
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 177,719 | 197,998
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 177,719 | 197,998
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 302,449 | 320,474
Unrealized Gains | 7 | 8
Unrealized Losses | (5,973) | (4,880)
Estimated Fair Value | 296,483 | 315,602
Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 54,997 | 43,715
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 54,997 | 43,715
U.S. Government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 67,793 | 47,014
Unrealized Gains | 6 | 0
Unrealized Losses | (1,760) | (1,312)
Estimated Fair Value | 66,039 | 45,702
Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 67,752 | 349,492
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 67,752 | 349,492
U.S. Government agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 49,354 | 37,572
Unrealized Gains | 0 | 0
Unrealized Losses | (642) | (586)
Estimated Fair Value | 48,712 | 36,986
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 50,438 | 54,782
Unrealized Gains | 2 | 0
Unrealized Losses | (786) | (611)
Estimated Fair Value | 49,654 | 54,171
Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 10,346 | 15,109
Unrealized Gains | 0 | 0
Unrealized Losses | (456) | (361)
Estimated Fair Value | $ 9,890 | 14,748
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost |  | 205
Unrealized Gains |  | 0
Unrealized Losses |  | 0
Estimated Fair Value |  | $ 205

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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