Nature Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009
Summary Of Significant Accounting Policies [Line Items]
Income taxes paid, net of refunds received	$ 9.5	$ 15.9	$ 16.5
Cash and cash equivalents to be classified as short-term investments		9.0	11.3
Capitalized software development costs	0	0	0
Advertising costs	2.9	2.5	3.1
Total refunds received	9.2
Cash paid for interest on long-term debt		0.1	0.1
Tax effect on accumulated unrealized losses on investments	2.0	2.1
No single customer represented more than percentage of consolidated accounts receivables or revenue	10.00%	10.00%	10.00%
Impairment losses on goodwill	0	0	0
Impairment losses on long-lived assets	$ 0	$ 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 asset, 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 asset, 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 asset, maximum (in years)	7
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation service period	four or five
Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation service period	three