Consolidated Statements of Shareholders' Equity (Unaudited) (Parentheticals)
3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Preferred stock, shares 0 0
Common stock, shares balance September 1 93,016,409 91,711,102
Exercise of stock options, shares 127,768 30,040
Shares exchanged for taxes on stock based compensation, shares (44,206) (2,264)
Stock-based compensation, shares 127,148 7,390
Common stock, shares Balance November 30 93,227,119 91,746,268
Treasury Stock Shares Balance September 1 26,591,241 20,404,720
Stock exchanged for taxes on stock-based compensation, shares   (954)
Treasury stock shares Balance November 30 26,591,241 20,405,674