Business Combinations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
May 31, 2012	Oct. 26, 2011
Business Combinations [Abstract]
Date of business acquisition	October 26, 2011
Purchase price		$ 23.0
Goodwill (not deductible for tax purposes)		$ 19.4

Month, date and year in which the acquirer obtains control of the acquiree.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 7: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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+ Details