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Fair Value Measurements - Carrying Values and Estimated Fair Values of Other Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable $ 1,123,001 $ 1,130,801
Carrying Amount | Senior Notes and Term Loan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 1,053,831 1,062,664
Carrying Amount | Junior Subordinated Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 69,170 68,137
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 1,196,473 1,166,254
Fair Value | Senior Notes and Term Loan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable 1,127,303 1,098,117
Fair Value | Junior Subordinated Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable $ 69,170 $ 68,137