Income Taxes (Schedule Of Provision (Benefit) For Income Taxes And Effective Income Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Income Taxes [Abstract]
Provision for income taxes	$ 8,184	$ 8,667	$ 12,389	$ 13,125
Effective income tax rate	35.60%	37.60%	33.60%	37.80%