Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Other Liabilities [Abstract]
Accrued compensations and benefits	$ 50,246	$ 36,237
Accrued interest	23,870	12,767
Customer deposits	18,937	11,539
Accrued warranty expenses	13,052	13,388	$ 15,331	$ 18,091
Litigation accruals	4,981	3,420
Income tax liabilities	584	648
Other	24,313	31,430
Total	$ 135,983	$ 109,429