Note 13. Employee Stock Option and Retirement Plans (Detail) - Summary of Stock Option Activity (USD $)	1 Months Ended			3 Months Ended
	Nov. 30, 2012	Jul. 31, 2012	Nov. 30, 2011	Nov. 30, 2012
Number outstanding				6,083,000
Weighted average exercise price per share (in Dollars per share)				$ 64.76
Granted, Number outstanding	1,011,510	241,546	665,551	1,646,818
Exercised				(253,000)
Exercised (in Dollars per share)				$ 46.79
Forfeited				(12,000)
Forfeited (in Dollars per share)				$ 85.28
Number outstanding	7,465,000			7,465,000
Weighted average exercise price per share (in Dollars per share)	$ 71.39			$ 71.39
Non-Performance Based [Member]
Granted, Number outstanding				635,000
Granted, Weighted average exercise price per share (in Dollars per share)				$ 92.22
Performance Based [Member]
Granted, Number outstanding				1,012,000
Granted, Weighted average exercise price per share (in Dollars per share)				$ 92.22