Note 16. Commitments and Contingencies (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011	Aug. 31, 2011
Square Footage of Real Estate Property			767,100
Operating Leases, Future Minimum Payments Due, Current	$ 13,476,000		$ 13,476,000
Operating Leases Percentage Of Increase In Lease Area			6.00%
Operating Leases, Rent Expense	8,700,000	7,900,000	17,100,000	15,600,000
Line of Credit Facility, Amount Outstanding	4,300,000		4,300,000
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		1,900,000		2,000,000
Norwalk, Connecticut [Member]
Square Footage of Real Estate Property			193,000
Operating Leases, Future Minimum Payments Due, Current	3,800,000		3,800,000
Non Cancelable Lease Term Period			8
New York, New York [Member]
Operating Leases, Future Minimum Payments Due, Current	$ 6,300,000		$ 6,300,000
Non Cancelable Lease Term Period			3.5