Fair Value Measurements And Derivatives Instruments (Fair Value Hierarchy Of Our Cash Equivalents, Marketable Securities And Foreign Currency Contracts) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2012	Nov. 30, 2011
Total Fair Value [Member]
Fair Value Measurements and Derivative Instruments [Line Items]
Mortgage-backed securities	$ 209	$ 225
Foreign currency forward contracts, assets		142
Foreign currency forward contracts, liabilities	70	142
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurements and Derivative Instruments [Line Items]
Mortgage-backed securities	209	225
Foreign currency forward contracts, assets		142
Foreign currency forward contracts, liabilities	70	142
Money Market Funds [Member] | Total Fair Value [Member]
Fair Value Measurements and Derivative Instruments [Line Items]
Cash and cash equivalents	16,687	16,664
Money Market Funds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value Measurements and Derivative Instruments [Line Items]
Cash and cash equivalents	16,687	16,664
Term Deposits [Member] | Total Fair Value [Member]
Fair Value Measurements and Derivative Instruments [Line Items]
Cash and cash equivalents	595	560
Term Deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurements and Derivative Instruments [Line Items]
Cash and cash equivalents	$ 595	$ 560