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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, 2017 | Sep. 30, 2016
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Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes | $ 1,259,840 | $ 1,207,526
Term Loan |  | 52,669
Junior Subordinated Notes | 61,937 | 59,870
Total debt, net | 1,321,777 | 1,320,065
Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes | 1,355,657 | 1,253,614
Term Loan |  | 52,669
Junior Subordinated Notes | 61,937 | 59,870
Total debt, net | $ 1,417,594 | $ 1,366,153

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