Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Taxes [Line Items]
Valuation allowance						$ 862	$ 572
Net tax benefit mostly related to reversal of tax reserves for federal income tax audit	$ 400	$ 500	$ 100	$ 1,100	$ 200	900	1,400	$ 800
Interest and penalties related to income tax matters in income tax expense						(100)	(200)
Accrued income tax penalties and interest for unrecognized tax benefits						300	$ 400
Accumulated undistributed foreign earnings						28,200
Maximum
Income Taxes [Line Items]
Estimated unrecognized deferred tax liability						800
State and Local Jurisdiction
Income Taxes [Line Items]
State research and development tax credits						700
Foreign Tax Authority
Income Taxes [Line Items]
Non-U.S. operating losses						$ 500