Derivative Instruments and Hedging Activities (Details 3) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Derivatives Designated as Hedging Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion), net of tax			$ 3,947,000
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			(6,731,000)
Derivatives Not Designated as Hedging Instruments
Amount of Gain or (Loss) Recognized in Income on Derivatives, Foreign Exchange Contracts	1,935,000	(2,846,000)	2,003,000
Total derivatives not designated as hedging instruments	1,935,000	(2,846,000)	2,003,000
Amount of gain or (loss) recognized in income on derivatives designated as hedging instruments, as a result of ineffectiveness or exclusion of such derivatives from effectiveness testing	0	0	0
Probable loss on counterparty defaults	0
Foreign exchange contracts
Credit-risk-related Contingent Features
Aggregate maximum fair value of all foreign exchange contracts held in a liability position	$ 100,000