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Fair Value Measurements - Carrying Values and Estimated Fair Values of Other Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes and Term Loan | $ 911,170 | $ 983,827
Junior Subordinated Notes | 72,270 | 70,203
Total debt, net | 983,440 | 1,054,030
Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes and Term Loan | 753,338 | 1,046,965
Junior Subordinated Notes | 72,270 | 70,203
Total debt, net | $ 825,608 | $ 1,117,168

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