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Stockholders' Equity (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 12 Months Ended |  |
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Apr. 05, 2020 Right $ / shares | Jan. 29, 2020 shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Nov. 30, 2019 USD ($) | Jul. 31, 2016 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Payments for repurchases of common stock | $ |  |  | $ 13,346 | $ 110,311 |  |  |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements | $ |  |  | $ 10,302 |  |  |  |
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 |  |  | 1 year 10 months 24 days |  |  |  |
Business closing date(Record Date) |  |  | Apr. 16, 2020 |  |  |  |
Preferred stock par value | $ / shares |  |  | $ 0.003 | $ 0.003 |  |  |
Rights Agreement [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred stock rights description |  |  | Each Right entitles the registered holder, upon the occurrence of specified events, to purchase from the Company one one thousandth of a share of Series B Participating Preferred Stock, par value $0.003 per share (the “Preferred Stock”), of the Company at an exercise price of $480.00 (the “Exercise Price”). In addition, each Right entitles the registered holder (other than any person or group that acquires 15% or more of the Company’s common stock without the approval of the Board), following the occurrence of other specified events, to purchase common stock of the Company or stock of any acquirer of the Company at a substantial discount. |  |  |  |
Rights maturity date | Apr. 05, 2021 |  |  |  |  |  |
Rights Agreement [Member] | Series B Participating Preferred Stock [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of share to purchase per right | 0.10% |  |  |  |  |  |
Preferred stock par value | $ / shares | $ 0.003 |  |  |  |  |  |
Rights exercise price | $ / shares | $ 480.00 |  |  |  |  |  |
Rights Agreement [Member] | Preferred Stock [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of preferred stock rights distributed per outstanding share as of business closing date | Right | 1 |  |  |  |  |  |
2017 Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of additional shares available for future grants | shares |  | 1,000 |  |  |  |  |
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 | $ / shares |  |  | $ 62.00 | $ 53.73 |  |  |
Stock Options [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  | 25.00% |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period, in years |  |  | 2 years |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche One [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 |  |  |  |
Shares of common stock repurchased | shares |  |  |  | 1,102 |  |  |
Payments for repurchases of common stock | $ |  |  |  | $ 110,311 | $ 0 |  |
2017 Authorization [Member] | 2017 Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available for future grants | shares |  |  | 1,972 |  |  |  |
2019 Authorization [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Repurchase period in years |  |  | 3 years |  |  |  |
Shares of common stock repurchased | shares |  |  | 124 |  |  |  |
Payments for repurchases of common stock | $ |  |  | $ 13,346 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Exercise prices of stock options outstanding | $ / shares |  |  | $ 127.84 |  |  |  |
Maximum [Member] | 2017 Authorization [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ |  |  |  |  |  |  | $ 500,000
Maximum [Member] | 2019 Authorization [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ |  |  |  |  |  | $ 500,000 |
Minimum [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Exercise prices of stock options outstanding | $ / shares |  |  | $ 25.57 |  |  |  |

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