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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 31, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | May 02, 2019 | Sep. 30, 2015
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 |  |  | 8,183 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  |  | 0 |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited |  |  | 114,067 |  |  |  |  |  |  |  |
Shares, vested |  |  | 121,102 |  |  |  |  |  |  |  |
Shares, Outstanding | 258,253 |  | 258,253 |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 20.29 |  | $ 22.32 |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 202 |  | $ 202 |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  | 32,323 | 17,427 |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 842,141 |  | 842,141 |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  |  | 1,000,000.0 | 1,500,000
Treasury Stock Acquired, Average Cost Per Share |  | $ 20.29 |  | $ 22.32 |  |  |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  | 32,323 | 17,427 |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 202 |  | $ 202 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  |  | 13,996 |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares, Issued |  |  |  |  | 22,807 |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | 36 | $ 521 | $ 109 | $ 1,316 |  |  |  |  |  |  |
Phantom Share Units (PSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | 93 | 97 | 280 | 293 |  |  |  |  |  |  |
Performance Based Phantom Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 928 | $ 505 | $ 2,336 | $ 1,121 |  |  |  |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 15,441 | 26,711 | 46,319 | 242,386 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  | 71,420 | 113,408 |  |  |  |  |  |  |
Shares, Issued | 1,192,793 | 1,002,521 | 1,192,793 | 1,002,521 |  | 1,210,685 | 1,287,134 | 977,863 | 884,518 |  |
Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares, Issued | 380 | 5,225 | 380 | 5,225 |  |  |  |  |  |  |
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 |  |  | 68,860 | 5,750 |  |  |  |  |  |  |
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 | 0 | 26,711 |  | 224,959 |  |  |  |  |  |  |

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