Net Classification of Deferred Income Tax Assets and Liabilities in Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Current deferred income tax asset	$ 6,422	$ 7,244
Non-current deferred income tax asset	1,586	75
Current deferred income tax liability	(10)	(23)
Non-current deferred income tax liability	(3,488)	(2,377)
Net deferred income tax assets	$ 4,510	$ 4,919