Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Feb. 29, 2012 Executives	Feb. 28, 2013 Stock Options [Member] Minimum [Member]	Feb. 28, 2013 Stock Options [Member] Maximum [Member]	Feb. 28, 2013 Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation award service period (in years)		4 years	5 years	3 years
Number of executives whose employment was terminated	1
Additional stock-based compensation expenses related to separation and acceleration vesting (in dollars)	$ 0.6

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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