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Equity Incentive Plans - Additional Information (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Sep. 30, 2023 USD ($) shares $ / shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common Stock Issuable per Restricted Stock Unit | shares |  | 1 |  |
Stock-based compensation |  | $ 206,459 | $ 174,863 | $ 177,289
Total unrecognized compensation cost |  | $ 204,400 |  |
Weighted average remaining recognition period, in months |  | 17 months |  |
Common stock were available for grant under the 2000 plan | shares |  | 7,300,000 |  |
Common stock were reserved for issuance | shares |  | 2,600,000 |  |
ESPP maximum contribution percentage |  | 10.00% |  |
ESPP maximum contribution amount by employee |  | $ 25,000 |  |
ESPP purchase price as a % of stock price |  | 85.00% |  |
Vesting term for outstanding awards |  | 1 year |  |
Shares withheld for tax withholding obligation | shares |  | 600,000 | 600,000 | 500,000
Payments of withholding taxes in connection with vesting of stock-based awards |  | $ 82,448 | $ 68,991 | $ 52,957
Liability classified awards related to stock-based compensation |  | 44,900 |  |
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation |  | $ 6,800 | $ 6,400 | $ 7,300
Restricted Shares and Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average fair value per share | $ / shares |  | $ 130.64 | $ 114.31 | $ 111.48
TSR Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average fair value per share | $ / shares |  | 179.6 |  |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average fair value per share | $ / shares | [1] | $ 130.64 |  |
Payments of withholding taxes in connection with vesting of stock-based awards |  | $ 82,800 | $ 69,000 | $ 53,100
[1] | RSUs granted includes 38 shares from prior period rTSR awards that were earned upon achievement of the performance criteria and vested in November 2022 and 61 shares from prior period performance-based awards that were earned upon achievement of the performance criteria and vested in November 2022.

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