Summary Of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Aug. 31, 2011 years	Aug. 31, 2010	Aug. 31, 2009
Schedule Of Significant Accounting Policies [Line Items]
Unbilled accounts receivable	$ 1,000,000
Accounts receivable reserve	1,955,000	1,862,000
Goodwill impairment	0	0	0
Intangible assets, estimated useful lives minimum	2
Intangible assets, estimated useful lives maximum	20
Impairment of intangible assets	0	0	0
Amortization	8,400,000	8,500,000	8,300,000
Cash contributions from landlords	1,400,000	500,000	2,600,000
Maximum term of hedge contracts, years	two
Accrued compensation	37,200,000	37,500,000
Accumulated foreign currency translation loss	(6,250,000)	(21,147,000)	(11,074,000)
Unrecognized tax benefits	7,204,000	7,346,000	6,437,000
Accrued interest of unrecognized tax benefits	900,000
Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of discretionary incentive compensation	20
Minimum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of discretionary incentive compensation	15
Internal Use Software [Member]
Schedule Of Significant Accounting Policies [Line Items]
Intangible assets, estimated useful lives maximum	3
Capitalized software development costs	900,000	800,000	800,000
Amortization	700,000	600,000	300,000
Product Development [Member]
Schedule Of Significant Accounting Policies [Line Items]
Capitalized software development costs	$ 0	$ 0
Capitalized software development costs, useful life	3
Computers And Related Equipment [Member]
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives maximum	3
Furniture And Fixtures [Member]
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives maximum	7
Property and equipment, estimated useful lives minimum	5