Income Taxes (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Line Items]
Valuation allowance	$ 572,000	$ 807,000
Net tax benefit mostly related to reversal of tax reserves for federal income tax audit	1,400,000
Net tax benefit mostly related to research & development tax credits		800,000	1,500,000
Interest and penalties related to income tax matters in income tax expense	(100,000)
Accrued income tax penalties and interest for unrecognized tax benefits	400,000	600,000
Accumulated undistributed foreign earnings	26,400,000
Minimum
Income Taxes [Line Items]
Estimated unrecognized deferred tax liability	500,000
Maximum
Income Taxes [Line Items]
Estimated unrecognized deferred tax liability	1,500,000
State and Local Jurisdiction
Income Taxes [Line Items]
State research and development tax credits	800,000
Foreign Tax Authority
Income Taxes [Line Items]
Non-U.S. operating losses	400,000
Non-U.S. tax credit carryforwards	$ 200,000