Derivative Instruments and Hedging Activities (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Derivatives Designated as Hedging Instruments
Amount of Gain or (Loss) Recognized in Income on Derivatives, Foreign Exchange Contracts	$ 2,731	$ 1,935	$ (2,846)
Total derivatives not designated as hedging instruments	2,731	$ 1,935	$ (2,846)
Probable loss on counterparty defaults	0
Foreign exchange contracts
Credit-risk-related Contingent Features
Aggregate fair value of all foreign exchange contracts held in a liability position	$ 100