Investments (Summary Of Marketable Securities Classified As Available-For-Sale) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2011	Nov. 30, 2010
Investments [Line Items]
Purchased/Amortized Cost	$ 17,424	$ 45,924
Gross Unrealized Gains	51
Gross Unrealized Losses	(26)	(10)
Aggregate Fair Value	17,449	45,914
Money Market Fund [Member]
Investments [Line Items]
Purchased/Amortized Cost	16,664	37,016
Aggregate Fair Value	16,664	37,016
Term Deposits [Member]
Investments [Line Items]
Purchased/Amortized Cost	560	8,707
Aggregate Fair Value	560	8,707
Mortgage-Backed Securities [Member]
Investments [Line Items]
Purchased/Amortized Cost	200	201
Gross Unrealized Gains	51
Gross Unrealized Losses	(26)	(10)
Aggregate Fair Value	$ 225	$ 191

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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