Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Other Liabilities [Abstract]
Accrued bonus and deferred compensation	$ 41,508	$ 36,753
Accrued warranty expenses	15,331	18,091	$ 39,131	$ 27,681
Customer deposits	14,903	11,704
Accrued interest	14,401	11,024
Litigation accrual	3,656	3,899
Income tax liabilities	710	811
Other	35,880	25,377
Total	$ 126,389	$ 107,659