Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Sep. 30, 2011
Financial assets:
Financial assets, fair value	$ 67,847		$ 41,528
Level 1 [Member]
Financial assets:
Cash equivalents-Level 1	67,650	[1]	36,018	[1]
Level 2 [Member]
Financial assets:
Forward contracts-Level 2	$ (197)		$ (5,510)

[1] Money market funds and time deposits.