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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Payments for repurchases of common stock |  | $ 110,311 |  | $ 71,751 |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements |  | $ 12,713 |  |  |
Forfeiture rate, Board of Directors |  | 0.00% |  |  |
Forfeiture rate, non-Board of Directors |  | 9.00% |  |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  | 2 years 2 months 12 days |  |  |
Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vested contractual term, in years |  | 10 years |  |  |
Vesting period, in years |  | 4 years |  |  |
Exercise prices of stock options outstanding |  | $ 53.73 | $ 45.42 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, in years |  | 2 years |  |  |
Share-based Payment Arrangement, Tranche One [Member] | Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rate |  | 25.00% |  |  |
Share-based Payment Arrangement, Tranche One [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rate |  | 50.00% |  |  |
2017 Authorization [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Repurchase period in years |  | 3 years |  |  |
Stock repurchase program authorized amount |  |  |  | $ 500,000 | $ 500,000
Shares of common stock repurchased |  | 1,102 | 0 | 1,027 |
Payments for repurchases of common stock |  | $ 110,311 |  | $ 71,197 |
2017 Authorization [Member] | 2017 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for future grants |  | 1,783 |  |  |
Number of additional shares available for future grants | 1,400 |  |  |  |
10b5-1 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares of common stock repurchased |  |  |  | 491 |
10b-18 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares of common stock repurchased |  |  |  | 536 |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise prices of stock options outstanding |  | $ 25.57 |  |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise prices of stock options outstanding |  | $ 116.10 |  |  |

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