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EQUITY AWARD PLANS - Stock Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ 55,396 | $ 44,946 | $ 42,011 | $ 35,515 | $ 37,805 | $ 50,351 | $ 52,607 | $ 90,728 | $ 177,868 | $ 231,491 | $ 20,056
Period for recognition (in years) |  |  |  |  |  |  |  |  | 2 years 8 months 12 days |  |
Cost of product revenue [Domain] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense |  |  |  |  |  |  |  |  | $ 2,580 | 3,066 | 391
Cost of revenue, support and other services |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | 2,789 | 1,951 | 2,133 | 2,072 | 2,201 | 2,471 | 2,389 | 3,350 | 8,945 | 10,411 | 968
Sales and marketing |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | 17,301 | 18,051 | 15,942 | 13,766 | 12,972 | 15,726 | 15,528 | 33,891 | 65,060 | 78,117 | 8,006
Research and development |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | 25,350 | 16,474 | 17,023 | 15,542 | 19,218 | 27,041 | 28,759 | 34,026 | 74,389 | 109,044 | 6,259
General and administrative |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ 9,264 | $ 7,836 | $ 6,229 | $ 3,565 | $ 2,772 | $ 4,503 | $ 5,083 | $ 18,495 | $ 26,894 | $ 30,853 | $ 4,432

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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