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v3.22.1

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | 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 |  |  | 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 |  | 321,463 |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 49.00 |  | $ 46.81 |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 95 |  | $ 95 |  |  |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  | 45,198 | 16,882 |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 713,151 |  | 713,151 |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  | 1,000,000.0 | 1,500,000
Treasury Stock Acquired, Average Cost Per Share |  | $ 49.00 |  | $ 46.81 |  |  |  |  |  |
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 | $ 95 |  | $ 95 |  |  |  |  |  |  |
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 | $ 36 | $ 71 | $ 74 |  |  |  |  |  |
Phantom Share Units (PSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | 96 | 90 | 193 | 186 |  |  |  |  |  |
Performance Based Phantom Shares [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 864 | $ 711 | $ 1,632 | $ 1,408 |  |  |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 2,587 |  | 104,200 | 30,878 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  | 73,627 | 38,087 |  |  |  |  |  |
Shares, Issued | 1,264,031 | 1,210,685 | 1,264,031 | 1,210,685 | 1,261,444 | 1,316,998 | 1,279,545 | 1,287,134 |  |
Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares, Issued |  | 380 |  | 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 | 68,860 |  |  |  |  |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized | 3,000,000.0 |  | 3,000,000.0 |  |  |  |  |  |  |
Repurchase Agreements [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 2,587 |  | 59,002 |  |  |  |  |  |  |

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