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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 29, 2020 | Nov. 30, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements |  |  | $ 10,913 |  |
Forfeiture rate, Board of Directors |  |  | 0.00% |  |
Forfeiture rate, non-Board of Directors |  |  | 7.00% |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  |  | 2 years |  |
2017 Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of additional shares available for future grants | 1,000,000 |  |  |  |
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 |  |  | $ 68.21 | $ 62.00 |
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% |  |
2017 Authorization [Member] | 2017 Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares available for future grants |  |  | 2,714,000 |  |
2019 Authorization [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 45,860 | $ 13,346 | $ 110,311
Repurchase period in years |  | 3 years |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  | 404,000 | 124,000 | 1,102,000
Stock repurchase program, number of shares authorized to be repurchased in-transit |  |  | 110,000 |  |
Stock repurchase program authorized in-transit amount |  |  | $ 12,516 |  |
Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Exercise prices of stock options outstanding |  |  | $ 127.84 |  |
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 |  |  | $ 33.64 |  |

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