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Equity Incentive Plan (Narrative) (Details) $ / shares in Units, shares in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2005 | Sep. 30, 2017 USD ($) shares / unit $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation |  | $ 76,708,000 | $ 65,996,000 | $ 50,182,000
Common stock issuable per restricted stock unit | shares / unit |  | 1 |  |
Total unrecognized compensation cost |  | $ 84,500,000 |  |
Weighted average remaining recognition period, in months |  | 17 months |  |
Common stock were available for grant under the 2000 plan | shares |  | 3,700 |  |
Common stock were reserved for issuance | shares |  | 3,500 |  |
vesting period | 4 years |  |  |
Option expiration period | 10 years |  |  |
Options outstanding and exercisable (in shares) | shares |  | 0 | 0 |
Shares retained by company to cover tax withholdings | shares |  | 500 | 600 | 800
Employee tax withholdings |  | $ 26,700,000 | $ 20,900,000 | $ 29,200,000
ESPP maximum contribution percentage |  | 10.00% |  |
ESPP maximum contribution amount by employee |  | $ 25,000 |  |
ESPP purchase price as a % of stock price |  | 85.00% |  |
Directors And Executive Officers [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-vesting forfeiture rate |  | 0.00% | 0.00% | 0.00%
Other Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-vesting forfeiture rate |  | 11.00% | 11.00% | 7.00%
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average fair value per share | $ / shares |  | $ 51.27 |  |
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 |  | $ 51.27 | $ 37.25 | $ 38.19
Employee Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation |  | $ 3,200,000 | $ 400,000 |
Minimum [Member] | Vice President [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-vesting forfeiture rate |  | 6.00% | 6.00% | 2.00%
Maximum [Member] | Vice President [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-vesting forfeiture rate |  | 8.00% | 8.00% | 4.00%
TSR Units [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average fair value per share | $ / shares |  | $ 68.02 |  |
stock modification [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation |  |  | $ 10,000,000 |
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 |  | $ 2.27 |  |

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