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Debt - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 15, 2021 | Dec. 13, 2019
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 150,000
Weighted average interest rate on debt | 1.34% |  |  |  |
Debt issuance costs | $ 2,300 |  |  | $ 2,600 |
Proceeds from long-term debt | 617 | $ 119,018 | $ 0 |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from long-term debt | 617 | 119,018 | 0 |  |
Repayments of long-term debt | 15,624 | $ 55,893 | $ 0 |  |
Debt issuance costs | $ 2,300 |  |  | 2,600 |
LIBOR | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 3.25% |  |  |  |
LIBOR | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.25% |  |  |  |
Term loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 50,000
Revolving loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 200,000 | $ 100,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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