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Debt - Narrative (Details) - USD ($) $ in Thousands |  |  | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 04, 2020 | Apr. 14, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 13, 2019
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 150,000
Weighted average interest rate on debt |  |  |  | 0.70% |  |  |
Debt issuance costs |  |  |  |  |  |  | 2,600
Proceeds from long-term debt |  |  |  | $ 119,018 | $ 0 | $ 0 |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from long-term debt |  |  |  | 119,018 | 0 | 0 |
Repayments of long-term debt |  |  |  | $ 55,893 | $ 0 | $ 0 |
Paycheck Protection Program loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Proceeds from long-term debt |  | $ 9,000 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from long-term debt |  | $ 9,000 |  |  |  |  |
Repayments of long-term debt | $ 9,000 |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 100,000
Year one | Term loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amortization percentage of quarterly installments |  |  |  |  |  |  | 5.00%
Year two | Term loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amortization percentage of quarterly installments |  |  |  |  |  |  | 5.00%
Year three | Term loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amortization percentage of quarterly installments |  |  |  |  |  |  | 7.50%
Year four | Term loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amortization percentage of quarterly installments |  |  |  |  |  |  | 7.50%
Year five | Term loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amortization percentage of quarterly installments |  |  |  |  |  |  | 10.00%

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