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Cash Equivalents and Short-Term Investments - Schedule of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands | Jan. 31, 2020 | Jul. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents, amortized cost | $ 43,874 |
Cash equivalents, unrealized gains | 0 |
Cash equivalents, unrealized losses | 0 |
Cash equivalents | 43,874 |
Short-term investments, amortized cost basis | 307,773 | $ 285,778
Short-term investment, unrealized gains | 635 | 462
Short-term investments, unrealized losses | (28) | (78)
Short-term investments | 308,380 | 286,162
Cash equivalents and short-term investments, amortized cost | 351,647 | 340,814
Cash equivalents and short-term investments, unrealized gains | 635 | 462
Cash equivalents and short-term investments, unrealized losses | (28) | (78)
Cash equivalents and short-term investments, estimated fair value | 352,254 | 341,198
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents, amortized cost | 42,374 | 55,036
Cash equivalents, unrealized gains | 0 | 0
Cash equivalents, unrealized losses | 0 | 0
Cash equivalents | 42,374 | 55,036
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash equivalents, amortized cost | 1,500 |
Cash equivalents, unrealized gains | 0 |
Cash equivalents, unrealized losses | 0 |
Cash equivalents | 1,500 |
Short-term investments, amortized cost basis | 112,956 | 64,689
Short-term investment, unrealized gains | 47 | 7
Short-term investments, unrealized losses | (23) | (50)
Short-term investments | 112,980 | 64,646
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Short-term investments, amortized cost basis | 71,914 | 125,042
Short-term investment, unrealized gains | 254 | 248
Short-term investments, unrealized losses | 0 | (9)
Short-term investments | 72,168 | 125,281
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Short-term investments, amortized cost basis | 122,903 | 96,047
Short-term investment, unrealized gains | 334 | 207
Short-term investments, unrealized losses | (5) | (19)
Short-term investments | $ 123,232 | $ 96,235

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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=118939692&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=118939692&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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