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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, 2021 | Sep. 30, 2020
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Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes | $ 983,827 | $ 1,062,664
Junior Subordinated Notes | 70,203 | 68,137
Total debt, net | 1,054,030 | 1,130,801
Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes | 1,046,965 | 1,098,117
Junior Subordinated Notes | 70,203 | 68,137
Total debt, net | $ 1,117,168 | $ 1,166,254

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