Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Other Liabilities Disclosure [Abstract]
Accrued interest	$ 25,760		$ 36,237
Accrued bonus and deferred compensation	24,108		12,767
Customer deposits	17,149		11,539
Accrued warranty expense	12,058	$ 12,646	13,388	$ 12,585	$ 13,432	$ 15,331
Litigation accrual	3,473		3,420
Income tax liabilities	1,000		648
Other	24,788		31,430
Total	$ 108,336		$ 109,429