Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 1,618	$ 2,301	$ 3,332
Increases related to prior year income tax positions	107	110	181
Increases related to current year income tax positions	240	144	148
Decreases related to prior year income tax positions	(71)	(255)	(1,105)
Decreases related to settlements	(30)	(74)	(95)
Decreases related to expiration of statute of limitations	(156)	(608)	(160)
Unrecognized tax benefits, ending balance	1,708	1,618	2,301
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate				$ 1,600
Expected change in unrecognized tax benefits, minimum				700
Unrecognized tax benefits	1,618	$ 2,301	$ 3,332	1,708
Noncurrent income taxes payable
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, ending balance	1,300
Income Tax Contingency [Line Items]
Unrecognized tax benefits	1,300			1,300
Noncurrent deferred tax assets
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, ending balance	400
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 400			$ 400