Share Based Compensation (Schedule Of Share-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense included in cost of operating revenues	$ 225	$ 157	$ 123
Allocated Share-based Compensation Expense	3,939	3,474	2,206
Share-based compensation epxense included in operating expenses	3,714	3,317	2,083
Total share-based compensation expense	3,939	3,474	2,206
Tax benefit	(1,493)	(1,317)	(836)
Share-based compensation expense, net of tax	2,446	2,157	1,370
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	189	120	60
Total share-based compensation expense	189	120	60
Selling and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	524	574	360
Total share-based compensation expense	524	574	360
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	3,001	2,623	1,663
Total share-based compensation expense	$ 3,001	$ 2,623	$ 1,663