Nature Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Summary Of Significant Accounting Policies [Line Items]
Tax effect on accumulated unrealized losses on investment	$ 1,500,000	$ 2,000,000	$ 2,100,000
Cash and cash equivalents to be classified as short-term investments			9,000,000
No single customer represented more than percentage of consolidated accounts receivables or revenue (percentage)	10.00%	10.00%	10.00%
Impairment of longlived assets, definite live intangible assets and goodwill		0	0
Capitalized software development costs	0	0	0
Advertising costs	1,500,000	2,900,000	2,500,000
Long-lived assets impairment charge	$ (898,000)	$ 0	$ 0
Computer equipment and software [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset, minimum (in years)	3
Useful lives of major assets, maximum (in years)	7
Buildings And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset, minimum (in years)	5
Useful lives of major assets, maximum (in years)	39
Furniture and fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset, minimum (in years)	5
Useful lives of major assets, maximum (in years)	7
Restricted Stock Units (RSUs) [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation service period (in years)	3 years
Minimum [Member] | Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation service period (in years)	4 years
Maximum [Member] | Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation service period (in years)	5 years