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Equity Incentive Plan - Schedule of Classification of Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 115,149 | $ 86,400 | $ 82,939
Sales and marketing |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 37,351 | 32,026 | 24,893
Research and development |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 27,005 | 22,019 | 13,488
General and administrative |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 36,824 | 20,416 | 33,033
License | Cost of Sales |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 47 | 509 | 144
Support and cloud services | Cost of Sales |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 6,910 | 5,004 | 4,302
Professional services | Cost of Sales |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 7,012 | $ 6,426 | $ 7,079

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