Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Other Liabilities Disclosure [Abstract]
Accrued bonus and deferred compensation	$ 22,254	$ 36,237
Accrued interest	17,328	12,767
Customer deposits	13,910	11,539
Accrued warranty expense	12,646	13,388	$ 13,432	$ 15,331
Litigation accrual	3,462	3,420
Income tax liabilities	825	648
Other	25,026	31,430
Total	$ 95,451	$ 109,429