Derivative Financial Instruments (Notional Amounts Of Outstanding Forward Contracts) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
Notional amounts of outstanding forward contracts	$ 206,781	$ 212,932
Canadian/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	73,571	92,748
Euro/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	55,623	65,773
Canadian Dollar/Euro [Member]
Notional amounts of outstanding forward contracts	23,499	0
Chinese Renminbi/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	14,780	19,973
Japanese Yen/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	13,374	13,676
Swiss Franc/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	8,932	9,419
British Pound/Euro [Member]
Notional amounts of outstanding forward contracts	6,127	3,993
All Other [Member]
Notional amounts of outstanding forward contracts	$ 10,875	$ 7,350