Fair Value Measurements And Derivatives Instruments (Fair Value Of Assets And Liabilities) (Details) (USD $) In Thousands	Aug. 31, 2011	Nov. 30, 2010
Money Market Funds [Member] \| Total Fair Value [Member]
Cash and cash equivalents	$ 10,956	$ 37,016
Money Market Funds [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Cash and cash equivalents	10,956	37,016
Term Deposits [Member] \| Total Fair Value [Member]
Cash and cash equivalents	571	8,707
Term Deposits [Member] \| Significant Other Observable Inputs Level 2 [Member]
Cash and cash equivalents	571	8,707
Total Fair Value [Member]
Mortgage-backed securities	239	191
Foreign currency forward contracts, assets	1	991
Foreign currency forward contracts, liabilities	97	53
Significant Other Observable Inputs Level 2 [Member]
Mortgage-backed securities	239	191
Foreign currency forward contracts, assets	1	991
Foreign currency forward contracts, liabilities	$ 97	$ 53

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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