Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Other Liabilities Disclosure [Abstract]
Accrued interest	$ 24,217	$ 14,401
Accrued bonus and deferred compensation	20,236	41,508
Customer deposits	13,462	14,903
Accrued warranty expense	13,432	15,331	$ 15,816	$ 18,091
Litigation accrual	3,348	3,656
Income tax liabilities	856	710
Other	37,082	35,880
Total	$ 112,633	$ 126,389