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Equity Incentive Plans - Additional Information (Details) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended
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Sep. 30, 2021 USD ($) shares / unit $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common Stock Issuable per Restricted Stock Unit | shares / unit | 1 |  |
Stock-based compensation | $ 177,289 | $ 115,149 | $ 86,400
Total unrecognized compensation cost | $ 190,300 |  |
Weighted average remaining recognition period, in months | 17 months |  |
Common stock were available for grant under the 2000 plan | shares | 4.1 |  |
Common stock were reserved for issuance | shares | 3.2 |  |
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 period | 1 year |  |
Shares withheld for tax withholding obligation | shares | 0.5 | 0.5 | 0.5
Payments of withholding taxes in connection with vesting of stock-based awards | $ 52,957 | $ 33,740 | $ 44,366
ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation | $ 7,300 | $ 5,800 | $ 6,200
Restricted Shares and Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value per share | $ / shares | $ 111.48 | $ 77.57 | $ 82.77
TSR Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value per share | $ / shares | $ 124.04 |  |
Vesting period | 3 years |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value per share | $ / shares | $ 111.48 |  |
Payments of withholding taxes in connection with vesting of stock-based awards | $ 53,100 | $ 33,700 | $ 44,400

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