Derivative Instruments and Hedging Activities (Details 2) - Instruments designated as accounting hedges: - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Derivative instruments and hedging activities
Asset derivatives:	$ 23,159	$ 13,309
Liability derivatives:	22,753	12,523
Foreign currency forwards | Other current assets
Derivative instruments and hedging activities
Asset derivatives:	9,693	7,389
Foreign currency forwards | Other noncurrent assets
Derivative instruments and hedging activities
Asset derivatives:	13,466	5,920
Foreign currency forwards | Other current liabilities
Derivative instruments and hedging activities
Liability derivatives:	9,287	6,645
Foreign currency forwards | Other noncurrent liabilities
Derivative instruments and hedging activities
Liability derivatives:	$ 13,466	$ 5,878