Income Tax Expense (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Expense [Line Items]
Accumulated unremitted earnings of foreign subsidiaries	$ 35,300
Accumulated unremitted earnings of foreign subsidiaries in cash	31,500
Income taxes due if foreign entities' earnings were distributed	4,900
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	100
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0	$ 0	$ 100
Capital loss carryforward, valuation allowance	500	400
Operating Loss Carryforwards, Valuation Allowance	300	300
Net operating loss carryforward - foreign	4,135	4,702
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	15,100
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	1,400
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	300
Deferred Tax Assets, Tax Credit Carryforwards, Research	1,700
State Research And Other Credit CarryForwards With Expiration Date	1,300
State Research And Other Credit Carry Forwards Without Expiration Date	400
Deferred Tax Assets, Valuation Allowance	4,129	4,297
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	200	500
Brazil, Germany, India, Finland, China and the United Kingdom [Member]
Income Tax Expense [Line Items]
Net operating loss carryforward - foreign	16,500
Foreign Valuation Allowance [Member]
Income Tax Expense [Line Items]
Operating Loss Carryforwards, Valuation Allowance	$ 3,300	$ 3,600