Income Tax Expense (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Income Tax Expense [Line Items]
Accumulated unremitted earnings of foreign subsidiaries	$ 46,300
Accumulated unremitted earnings of foreign subsidiaries in cash	45,200
Income taxes due if foreign entities' earnings were distributed	7,400
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	100	$ 100
Capital loss carryforward, valuation allowance	600	500
Operating Loss Carryforwards, Valuation Allowance	300	300
Net operating loss carryforward - foreign	4,991	4,135
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	17,700
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	1,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	300
Deferred Tax Assets, Tax Credit Carryforwards, Research	1,900
State Research And Other Credit CarryForwards With Expiration Date	1,500
State Research And Other Credit Carry Forwards Without Expiration Date	400
Deferred Tax Assets, Valuation Allowance	5,711	4,129
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	1,600	200
Brazil, Germany, India, Finland, China and the United Kingdom [Member]
Income Tax Expense [Line Items]
Net operating loss carryforward - foreign	18,700
Foreign Valuation Allowance [Member]
Income Tax Expense [Line Items]
Operating Loss Carryforwards, Valuation Allowance	$ 4,800	$ 3,300