Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019
Other Liabilities Disclosure [Abstract]
Accrued compensations and benefits	$ 44,354		$ 50,246
Customer deposits	28,725		18,937
Accrued interest	15,253		23,870
Warranty reserve	12,346	$ 12,421	13,052	$ 12,292	$ 12,058	$ 13,388
Litigation accruals	4,511		4,981
Income tax liabilities	770		584
Other	33,115		24,313
Total	$ 139,074		$ 135,983