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Financing - Narrative (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Aug. 24, 2017 | Aug. 17, 2017 | Jul. 01, 2015 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2020 | Jun. 30, 2017
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 74,141,000 | $ 74,141,000 |  |  | $ 82,839,000 |
Repayments of debt |  |  |  |  |  | 8,800,000 | $ 0 |  |  |
Term loan |  |  |  |  | 75,000,000 | 75,000,000 |  |  | 75,000,000 |
Debt issuance costs |  |  |  |  | 859,000 | 859,000 |  |  | $ 961,000 |
Derivative, term of contract |  |  |  | 5 years |  |  |  |  |  |
Fixed quarterly interest rate (as a percent) |  |  |  | 1.52% |  |  |  |  |  |
Derivative notional amount |  |  |  | $ 39,250,000 |  |  |  |  |  |
Outstanding balance (equal to) (as a percent) |  |  |  | 50.00% |  |  |  |  |  |
Derivative, loss on derivative |  |  |  |  |  |  | $ 38,000 |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 120,000,000 | 120,000,000 |  |  |  |
Long-term debt |  |  |  |  | 75,000,000 | 75,000,000 |  |  |  |
Outstanding letters of credit |  |  |  |  | 1,185,000 | 1,185,000 |  |  |  |
Repayments of debt |  |  |  |  | 8,800,000 |  |  |  |  |
Purchase of stock (up to) |  |  |  |  |  | 2,000,000 |  |  |  |
Share repurchase (up to) |  |  |  |  |  | 35,000,000 |  |  |  |
Dividend and distributions (up to) |  |  |  |  |  | 10,000,000 |  |  |  |
Deferred finance costs |  |  |  |  |  |  |  |  |  | $ 2,074,000
Debt issuance costs |  |  |  |  | 671,000 | 671,000 |  |  |  |
Credit Agreement | Long-term Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 50,000,000 |  |  |  |  |  |  |  |
Term loan |  |  |  |  | 75,000,000 | 75,000,000 |  |  |  |
Write off of deferred debt issuance cost |  |  |  |  |  |  |  | $ 829,000 |  |
Credit Agreement | Long-term Debt | Forecast |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, periodic payment | $ 3,000,000 |  |  |  |  |  |  |  |  |
Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  |  | $ 0 | $ 0 |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 1.40% | 1.40% |  |  |  |
Credit Agreement | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee rate (as a percent) |  |  |  |  |  | 0.20% |  |  |  |
Credit Agreement | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee rate (as a percent) |  |  |  |  |  | 0.40% |  |  |  |
Credit Agreement | Revolving Credit Facility | Federal Funds |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  | 0.50% |  |  |  |
Credit Agreement | Revolving Credit Facility | Base Rate |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  | 1.00% |  |  |  |
Credit Agreement | Revolving Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  | 0.25% |  |  |  |
Credit Agreement | Revolving Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  | 1.25% |  |  |  |
Credit Agreement | Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  | 1.25% |  |  |  |
Credit Agreement | Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  | 2.25% |  |  |  |
Credit Agreement | Long-term Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 50,000,000 |  |  |  |  |  |  |

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