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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2023 | Jan. 31, 2022 | Jan. 26, 2022 | Nov. 30, 2019 | Mar. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2024 | Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of additional shares available for future grants | 500,000 |  |  |  |  |  |  |
Stock compensation expense, before tax |  |  |  |  | $ 1,265 |  |  |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements |  |  |  |  | $ 26,750 | $ 26,750 |  |
Forfeiture rate, Board of Directors |  |  |  |  | 0.00% | 0.00% |  |
Forfeiture rate, non-Board of Directors |  |  |  |  | 7.30% | 7.30% |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  |  |  |  |  | 1 year 9 months 18 days |  |
2017 Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of additional shares available for future grants |  |  | 800,000 |  |  |  |  |
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 |  |
Weighted-average exercise price |  |  |  |  | $ 100.49 | $ 83.76 |  |
Stock Options [Member] | Share-based Compensation Award Tranche One [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting rate |  |  |  |  |  | 25.00% |  |
2019 Authorization [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  | $ 500,000 | $ 26,742 | $ 26,742 |  |
Repurchase period in years |  |  |  | 3 years |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  | 233,000 | 233,000 |  |
2022 Authorization [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  | $ 800,000 |  |  | $ 245,357 | $ 245,357 |  |
Repurchase period in years |  | 2 years |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  | 2,047,000 | 2,047,000 |  |
2022 Authorization [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  |  | $ 26,369 |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  |  |  | 274,000 |
2017 Authorization [Member] | 2017 Plan [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares available for future grants |  |  |  |  | 2,709 | 2,709 |  | 2,938,000

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