Note 11. Common Stock and Earnings Per Share (Detail) - Shares of Common Stock Outstanding	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Balance at September 1	44,279,214	45,055,000
Common stock issued for employee stock plans	333,000	209,000
Repurchase of common stock	(270,000)	(150,000)
Balance at November 30	44,342,402	45,114,000