Consolidated Statements Of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data	Aug. 31, 2011	Aug. 31, 2010
Consolidated Statements Of Financial Condition [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,955	$ 1,862
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	61,427,391	60,142,905
Common stock, shares outstanding	45,055,219	46,024,137
Treasury stock, shares	16,372,172	14,118,768