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Equity Incentive Plan (Narrative) (Details) $ / shares in Units, shares in Millions | 12 Months Ended
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Sep. 30, 2019 USD ($) shares / unit $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock issuable per restricted stock unit | shares / unit | 1 |  |
Share-based Payment Arrangement, Noncash Expense | $ 86,400,000 | $ 82,939,000 | $ 76,708,000
Total unrecognized compensation cost | $ 159,200,000 |  |
Weighted average remaining recognition period, in months | 22 months |  |
Common stock were available for grant under the 2000 plan | shares | 6.9 |  |
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% |  |
Shares withheld for tax withholding obligation | shares | 0.5 | 0.7 | 0.5
Payments of withholding taxes in connection with vesting of stock-based awards | $ 44,366,000 | $ 45,374,000 | $ 26,654,000
Restricted Shares and Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value per share | $ / shares | $ 82.77 | $ 76.17 | $ 51.27
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Payment Arrangement, Noncash Expense | $ 6,200,000 | $ 4,300,000 | $ 3,200,000
TSR Units [Member] | Restricted Shares and Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value per share | $ / shares | $ 4.62 | $ 4.35 | $ 2.27

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