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Fair Value of Financial Instruments (Details 1) - USD ($) $ in Thousands | Jan. 31, 2022 | Jul. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 993,382 | $ 1,201,932
Unrealized Gains | 156 | 739
Unrealized Losses | (3,029) | (47)
Estimated Fair Value | 990,509 | 1,202,624
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 241,734 | 389,837
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 241,734 | 389,837
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 381,914 | 371,374
Unrealized Gains | 139 | 623
Unrealized Losses | (1,807) | (37)
Estimated Fair Value | 380,246 | 371,960
Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 63,051 | 82,250
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 63,051 | 82,250
U.S. Government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 75,301 | 64,401
Unrealized Gains | 17 | 62
Unrealized Losses | (607) | (1)
Estimated Fair Value | 74,711 | 64,462
Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 106,208 | 125,118
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 106,208 | 125,118
U.S. Government agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 32,639 | 85,165
Unrealized Gains | 0 | 15
Unrealized Losses | (228) | 0
Estimated Fair Value | 32,411 | 85,180
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 55,924 | 47,925
Unrealized Gains | 0 | 29
Unrealized Losses | (211) | (7)
Estimated Fair Value | 55,713 | 47,947
Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 35,406 | 33,177
Unrealized Gains | 0 | 10
Unrealized Losses | (175) | (2)
Estimated Fair Value | 35,231 | 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 | (1) | 0
Estimated Fair Value | 204 | 1,685
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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- 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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