Derivative Instruments and Hedging Activities (Reconciliation Of The Net Fair Value Of Designated Hedge Derivatives) (Details) - Currency exchange contracts gain (loss) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Offsetting Derivative Assets [Abstract]
Gross Recognized Amount	$ 7,019	$ 3,572
Gross Offset Amount	0	0
Net Amount Presented	7,019	3,572
Derivatives Subject to Offset	(94)	(210)
Cash Collateral Received	0	0
Net Amount	6,925	3,362
Offsetting Derivative Liabilities [Abstract]
Gross Recognized Amount	1,432	551
Gross Offset Amount	0	0
Net Amount Presented	1,432	551
Derivatives Subject to Offset	(94)	(210)
Cash Collateral Received	0	0
Net Amount	$ 1,338	$ 341