Accumulated Other Comprehensive Income Loss - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Foreign currency translation adjustments	$ 3,200	$ (10,472)	$ (1,406)	$ (809)
Increase to non-current deferred income tax liabilities	$ 3,200	$ 3,200