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FAIR VALUE MEASUREMENTS - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2020 | Jul. 31, 2019
--- | --- | ---
Financial Assets: |  |
Short-term investments: | $ 469,806 | $ 512,156
Recurring |  |
Financial Assets: |  |
Total measured at fair value | 581,348 | 778,270
Cash | 150,789 | 130,564
Total cash, cash equivalents and short-term investments | 732,137 | 908,834
Recurring | Corporate bonds |  |
Financial Assets: |  |
Short-term investments: | 370,210 | 354,549
Recurring | Commercial paper |  |
Financial Assets: |  |
Short-term investments: | 46,375 | 92,851
Recurring | U.S. government securities |  |
Financial Assets: |  |
Short-term investments: | 53,221 | 64,756
Recurring | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 100,550 | 33,156
Recurring | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 10,992 | 103,029
Recurring | U.S. government securities |  |
Financial Assets: |  |
Cash equivalents: |  | 119,933
Recurring | Corporate bonds |  |
Financial Assets: |  |
Cash equivalents: |  | 9,996
Recurring | Level I |  |
Financial Assets: |  |
Total measured at fair value | 100,550 | 33,156
Recurring | Level I | Corporate bonds |  |
Financial Assets: |  |
Short-term investments: | 0 | 0
Recurring | Level I | Commercial paper |  |
Financial Assets: |  |
Short-term investments: | 0 | 0
Recurring | Level I | U.S. government securities |  |
Financial Assets: |  |
Short-term investments: | 0 | 0
Recurring | Level I | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 100,550 | 33,156
Recurring | Level I | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 0 | 0
Recurring | Level I | U.S. government securities |  |
Financial Assets: |  |
Cash equivalents: |  | 0
Recurring | Level I | Corporate bonds |  |
Financial Assets: |  |
Cash equivalents: |  | 0
Recurring | Level II |  |
Financial Assets: |  |
Total measured at fair value | 480,798 | 745,114
Recurring | Level II | Corporate bonds |  |
Financial Assets: |  |
Short-term investments: | 370,210 | 354,549
Recurring | Level II | Commercial paper |  |
Financial Assets: |  |
Short-term investments: | 46,375 | 92,851
Recurring | Level II | U.S. government securities |  |
Financial Assets: |  |
Short-term investments: | 53,221 | 64,756
Recurring | Level II | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 0 | 0
Recurring | Level II | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 10,992 | 103,029
Recurring | Level II | U.S. government securities |  |
Financial Assets: |  |
Cash equivalents: |  | 119,933
Recurring | Level II | Corporate bonds |  |
Financial Assets: |  |
Cash equivalents: |  | 9,996
Recurring | Level III |  |
Financial Assets: |  |
Total measured at fair value | 0 | 0
Recurring | Level III | Corporate bonds |  |
Financial Assets: |  |
Short-term investments: | 0 | 0
Recurring | Level III | Commercial paper |  |
Financial Assets: |  |
Short-term investments: | 0 | 0
Recurring | Level III | U.S. government securities |  |
Financial Assets: |  |
Short-term investments: | 0 | 0
Recurring | Level III | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 0 | 0
Recurring | Level III | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | $ 0 | 0
Recurring | Level III | U.S. government securities |  |
Financial Assets: |  |
Cash equivalents: |  | 0
Recurring | Level III | Corporate bonds |  |
Financial Assets: |  |
Cash equivalents: |  | $ 0

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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