Summary Of Significant Accounting Policies (Notional Amounts Of Outstanding Forward Contracts) (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010
Notional amounts of outstanding forward contracts	$ 212,932	$ 148,813
Canadian /U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	92,748	1,280
Euro/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	65,773	113,546
British Pound/Euro [Member]
Notional amounts of outstanding forward contracts	3,993
Indian Rupee/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts		20,262
Chinese Renminbi/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	19,973	5,443
Japanese Yen/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	13,676
Swiss Franc/U.S. Dollar [Member]
Notional amounts of outstanding forward contracts	9,419
All Other [Member]
Notional amounts of outstanding forward contracts	$ 7,350	$ 8,282