Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Provision for income taxes attributable to continuing operations
Income taxes (benefit) at the federal statutory rate	$ (31,798)	$ (3,933)	$ 11,071
Non-deductible expense related to incentive stock options	13	0	0
State income tax, net of federal benefit	(701)	(1,543)	271
Change in valuation allowance	6,055	481	680
Federal tax credits	(4,567)	(124)	(314)
Foreign tax credit and valuation allowance	(3,440)	(2,174)	(3,263)
Tax basis balance sheet adjustment	4,488	0	0
Effect of permanently reinvesting foreign earnings	880	(445)	86
Other	2,375	492	566
Total income tax (benefit) expense	$ (26,695)	$ (7,246)	$ 9,097
Effective tax rate	29.00%	64.00%	29.00%