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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | May 02, 2019 | Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common Stock, Shares Authorized | 100,000,000 |  | 100,000,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 3,118 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | 0 |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited | 4,962 |  |  |  |  |
Shares, vested | 106,964 |  |  |  |  |
Shares, Outstanding | 321,463 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 46.71 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 131 |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 45,198 | 16,882 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 715,054 |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 1,000,000.0 | 1,500,000
Treasury Stock Acquired, Average Cost Per Share |  | $ 46.71 |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 45,198 | 16,882 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 131 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  | 13,996 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 150,447 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 36 | $ 38 |  |  |  |
Phantom Share Units (PSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Payment Arrangement, Expense | 96 | 96 |  |  |  |
Performance Based Phantom Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 768 | $ 697 |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 101,613 | 30,878 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 73,627 | 38,087 |  |  |  |
Shares, Issued | 1,261,444 | 1,279,545 | 1,316,998 | 1,287,134 |  |
Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares, Issued |  | 380 |  |  |  |
Share-based Payment Arrangement, Employee [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 83,540 |  |  |  |  |
Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common Stock, Shares Authorized | 3,000,000.0 |  |  |  |  |
Repurchase Agreements [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 56,415 |  |  |  |

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