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FAIR VALUE MEASUREMENTS - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Oct. 31, 2020 | Jul. 31, 2020
--- | --- | ---
Financial Assets: |  |
Short-term investments: | $ 813,603 | $ 401,041
Recurring |  |
Financial Assets: |  |
Total measured at fair value | 1,116,495 | 552,976
Cash | 201,590 | 166,802
Total cash, cash equivalents and short-term investments | 1,318,085 | 719,778
Recurring | Corporate bonds |  |
Financial Assets: |  |
Short-term investments: | 532,904 | 345,265
Recurring | Commercial paper |  |
Financial Assets: |  |
Short-term investments: | 151,267 | 29,702
Recurring | U.S. government securities |  |
Financial Assets: |  |
Short-term investments: | 129,432 | 26,074
Recurring | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 260,398 | 142,936
Recurring | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 42,494 | 8,999
Recurring | Level I |  |
Financial Assets: |  |
Total measured at fair value | 260,398 | 142,936
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: | 260,398 | 142,936
Recurring | Level I | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 0 | 0
Recurring | Level II |  |
Financial Assets: |  |
Total measured at fair value | 856,097 | 410,040
Recurring | Level II | Corporate bonds |  |
Financial Assets: |  |
Short-term investments: | 532,904 | 345,265
Recurring | Level II | Commercial paper |  |
Financial Assets: |  |
Short-term investments: | 151,267 | 29,702
Recurring | Level II | U.S. government securities |  |
Financial Assets: |  |
Short-term investments: | 129,432 | 26,074
Recurring | Level II | Money market funds |  |
Financial Assets: |  |
Cash equivalents: | 0 | 0
Recurring | Level II | Commercial paper |  |
Financial Assets: |  |
Cash equivalents: | 42,494 | 8,999
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

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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=120391452&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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- Definition Fair value portion 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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: 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=120391452&loc=d3e13212-122682 + Details
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