Business Combinations (Narrative) (Details) (USD $)	12 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Oct. 26, 2011 Corticon Technologies, Inc. [Member]	Nov. 30, 2011 Corticon Technologies, Inc. [Member]	Jan. 08, 2010 Savvion, Inc. [Member]	Nov. 30, 2011 Savvion, Inc. [Member]	Nov. 30, 2010 Savvion, Inc. [Member]
Business Acquisition [Line Items]
Date of business acquisition				October 26, 2011			January 8, 2010
Cash payment, net of cash acquired	$ 22,900,000	$ 49,186,000	$ 22,900,000		$ 49,186,000
Goodwill (not deductible for tax purposes)			24,842,000		19,705,000
Revenues						$ 26,400,000	$ 19,500,000