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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, 2020 | Sep. 30, 2019
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Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes | $ 1,062,664 | $ 1,111,085
Junior Subordinated Notes | 68,137 | 66,070
Total debt, net | 1,130,801 | 1,177,155
Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes | 1,098,117 | 1,115,011
Junior Subordinated Notes | 68,137 | 66,070
Total debt, net | $ 1,166,254 | $ 1,181,081

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