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Equity Incentive Plan - Additional Information (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Sep. 30, 2020 USD ($) shares / unit $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 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 | $ | $ 115,149 | $ 86,400 | $ 82,939
Total unrecognized compensation cost | $ | $ 213,500 |  |
Weighted average remaining recognition period, in months | 19 months |  |
Common stock were available for grant under the 2000 plan | shares | 5,300 |  |
Common stock were reserved for issuance | shares | 3,500 |  |
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 3 months 18 days |  |
Shares withheld for tax withholding obligation | shares | 500 | 500 | 700
Payments of withholding taxes in connection with vesting of stock-based awards | $ | $ 33,740 | $ 44,366 | $ 45,374
ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation | $ | $ 5,800 | $ 6,200 | $ 4,300
Restricted Shares and Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value per share | $ / shares | $ 77.57 | $ 82.77 | $ 76.17
TSR Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value per share | $ / shares | $ 106.69 |  |
Granted, shares | shares | 101 |  |
TSR Units | Catch-Up Provision | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted, shares | shares | 202 |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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