Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Other Liabilities [Abstract]
Accrued warranty expenses	$ 18,091	$ 39,131	$ 27,681	$ 16,084
Accrued bonus and deferred compensation	36,753	30,466
Customer deposits	11,704	12,140
Accrued interest	11,024	11,530
Litigation accrual	3,899	10,178
Income tax liabilities	811	1,718
Other	25,377	29,090
Total	$ 107,659	$ 134,253