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Equity Incentive Plans - Schedule of Classification of Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 177,289 | $ 115,149 | $ 86,400
Sales and marketing |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 53,712 | 37,351 | 32,026
Research and development |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 34,272 | 27,005 | 22,019
General and administrative |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 70,042 | 36,824 | 20,416
License | Cost of Sales |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 100 | 47 | 509
Support and cloud services | Cost of Sales |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 9,900 | 6,910 | 5,004
Professional services | Cost of Sales |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 9,263 | $ 7,012 | $ 6,426

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