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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, 2019
Sep. 30, 2018
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior Notes $ 1,111,085 $ 1,163,138
Junior Subordinated Notes (c) 66,070 64,003
Total debt, net 1,177,155 1,227,141
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior Notes 1,115,011 1,096,214
Junior Subordinated Notes (c) 66,070 64,003
Total debt, net $ 1,181,081 $ 1,160,217