Investments (Marketable Securities Classified As Available-For-Sale) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2012	Nov. 30, 2011
Schedule of Investments [Line Items]
Purchased/Amortized Cost	$ 17,475	$ 17,424
Gross Unrealized Gains	49	51
Gross Unrealized Losses	(33)	(26)
Aggregate Fair Value	17,491	17,449
Money Market Funds [Member]
Schedule of Investments [Line Items]
Purchased/Amortized Cost	16,687	16,664
Aggregate Fair Value	16,687	16,664
Term Deposits [Member]
Schedule of Investments [Line Items]
Purchased/Amortized Cost	595	560
Aggregate Fair Value	595	560
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Purchased/Amortized Cost	193	200
Gross Unrealized Gains	49	51
Gross Unrealized Losses	(33)	(26)
Aggregate Fair Value	$ 209	$ 225

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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+ Details

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details