Derivative Financial Instruments (Notional Amounts Of Outstanding Forward Contracts) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Notional amounts of outstanding forward contracts	$ 160,811	$ 212,932
Canadian/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	64,274	92,748
Euro/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	38,888	65,773
Canadian Dollar/Euro [Member]
Notional amounts of outstanding forward contracts	4,781	0
Chinese Renminbi/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	5,480	19,973
Japanese Yen/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	22,150	13,676
Swiss Franc/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	9,167	9,419
British Pound/Euro [Member]
Notional amounts of outstanding forward contracts	5,706	3,993
All Other [Member]
Notional amounts of outstanding forward contracts	$ 10,365	$ 7,350