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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, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 216,205 | $ 223,461 | $ 206,459
Sales and marketing |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 61,750 | 68,541 | 56,394
Research and development |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 65,119 | 60,266 | 58,931
General and administrative |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 66,646 | 73,215 | 70,260
License | Cost of Sales |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 409 | 133 | 145
Support and cloud services | Cost of Sales |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 16,435 | 14,479 | 12,801
Professional services | Cost of Sales |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 5,846 | $ 6,827 | $ 7,928

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