Earnings Per Share (Details)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Basic 29,059 29,293 29,038 29,255
Incremental shares from equity awards 218 432 202 413
Diluted 29,277 29,725 29,240 29,668