Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Provision for income taxes attributable to continuing operations
Income tax expense (benefit) at the federal statutory rate	$ 128	$ (23,172)	$ 2,761
State taxes, net of federal benefit	2,476	(701)	(909)
Captive insurance company	0	(393)	(410)
Non-deductible items	1,718	449	457
Foreign tax credit	2,788	(2,413)	(2,174)
Foreign rate differential	277	880	0
Change in valuation allowance	1,511	4,846	481
Uncertain tax positions	0	(1,781)	(3,016)
Tax basis balance sheet adjustment	0	2,516	941
Other	463	2,182	288
Total income tax expense (benefit)	$ 9,361	$ (14,025)	$ 4,451
Effective tax rate	2579.00%	21.00%	56.00%