Note 16. Commitments and Contingencies (Detail) (USD $)	3 Months Ended		9 Months Ended	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	May 31, 2011	Aug. 31, 2011
Operating Leases, Future Minimum Payments Due, Current				$ 20,002,000
Operating Leases Percentage Of Increase In Lease Area	6.00%	18.00%	766000.00%
Operating Leases, Rent Expense	8,400,000	7,700,000
Line of Credit Facility, Amount Outstanding	4,400,000
Long-term Purchase Commitment, Amount				47,800,000
Largest Individual Client Percent Of Total Subscriptions	2.00%
Percentage Of Subscription From Ten Largest Clients	16.00%
Allowance for Doubtful Accounts Receivable	1,900,000			2,000,000
Norwalk, Connecticut [Member]
Square Footage of Real Estate Property	192,500
Operating Leases, Future Minimum Payments Due, Current	3,800,000
Non Cancelable Lease Term Period	8
New York, New York [Member]
Operating Leases, Future Minimum Payments Due, Current	$ 6,300,000
Non Cancelable Lease Term Period			3.5