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Long-Term Debt - Narrative (Details) - USD ($) |  |  |  | 6 Months Ended | 9 Months Ended | 27 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2022 | Jul. 31, 2021 | Jul. 31, 2018 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2022 | Feb. 21, 2021 | Dec. 23, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal repayment |  |  |  |  |  | $ 226,400,000 | $ 0 |  |  |
Outstanding balances |  |  |  |  | $ 224,800,000 | 0 |  |  |  |
Debt discount reclassified to other assets |  |  |  |  |  | 1,800,000 |  |  |  |
Unamortized debt discount |  |  |  |  | 1,900,000 |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum aggregate principal commitment |  |  |  |  |  |  |  |  |  | $ 300,000,000
Principal repayment |  |  |  | $ 226,400,000 |  |  |  |  |  |
Revolving credit facility | Amended facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | Jul. 31, 2023 |  |  |  |  |  |  |
Maximum aggregate principal commitment |  |  | $ 350,000,000 |  | 350,000,000 | $ 250,000,000 |  |  | $ 300,000,000 |
Minimum liquidity covenant |  |  |  |  |  |  |  |  | 150,000,000 |
Minimum unrestricted cash and cash equivalents threshold per covenant |  |  |  |  |  |  |  |  | $ 150,000,000 |
Principal repayment |  | $ 106,400,000 |  |  | $ 0 |  |  |  |  |
Revolving credit facility | Amended facility | Forecast |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Undrawn fee (percent) |  |  |  |  |  |  |  | 0.50% |  |
LIBOR floor (percent) |  |  |  |  |  |  |  | 1.00% |  |
Revolving credit facility | Amended facility | Forecast | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Undrawn fee (percent) | 0.25% |  |  |  |  |  |  |  |  |
Revolving credit facility | Amended facility | Forecast | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Undrawn fee (percent) | 0.45% |  |  |  |  |  |  |  |  |
Revolving credit facility | Amended facility | LIBOR | Forecast |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on rate (percent) |  |  |  |  |  |  |  | 3.50% |  |
Revolving credit facility | Amended facility | LIBOR | Forecast | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on rate (percent) | 1.50% |  |  |  |  |  |  |  |  |
Revolving credit facility | Amended facility | LIBOR | Forecast | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on rate (percent) | 2.50% |  |  |  |  |  |  |  |  |

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