Income Taxes - Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Current tax provision (benefit):
U.S. Federal		$ (32,116)	$ 14,328
State	$ 672	(1,375)	2,613
Foreign	176	203	1,888
Current income tax expense	848	(33,288)	18,829
Deferred tax (benefit) expense:
U.S. Federal	25,338	326	(2,886)
State	3,890	(4,422)	(526)
Foreign	(3,051)	(2,187)	4,240
Total deferred tax (benefit) expense	26,177	(6,283)	828
Total provision	$ 27,025	$ (39,571)	$ 19,657