Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Other Liabilities Disclosure [Abstract]
Accrued compensations and benefits	$ 26,826	$ 50,246
Customer deposits	22,917	18,937
Accrued interest	15,613	23,870
Warranty reserve	12,616	13,052	$ 12,646	$ 13,388
Litigation accruals	5,066	4,981
Income tax liabilities	722	584
Other	26,504	24,313
Total	$ 110,264	$ 135,983