Derivative Instruments and Hedging Activities (Details 3) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Derivative instruments and hedging activities
Gains (losses) recognized in OCI	$ 2,066,000	$ (1,126,000)	$ (314,000)	$ (2,056,000)
Gains (losses) reclassified into earnings - Effective Portion	84,000	20,000	35,000	(2,052,000)
Gain related to derivative instruments classified as not highly effective	434,000		837,000
Estimated unrealized net gains from cash flow hedges which are expected to be reclassified into earnings in the next twelve months	100,000		100,000
Foreign currency forwards
Derivative instruments and hedging activities
Gains (losses) recognized in OCI	2,066,000	(1,435,000)	(97,000)	(1,892,000)
Gains (losses) reclassified into earnings - Effective Portion	84,000	20,000	35,000	(2,052,000)
Forward starting swap
Derivative instruments and hedging activities
Gains (losses) recognized in OCI		309,000	(217,000)	(164,000)
Forward starting swap | Other income/(expense), net
Derivative instruments and hedging activities
Gain related to derivative instruments classified as not highly effective	$ 434,000		$ 837,000