Note 13. Employee Stock Option and Retirement Plans (Detail) - Summary of Stock Option Activity (USD $)	0 Months Ended		1 Months Ended			3 Months Ended		6 Months Ended
	Jan. 15, 2013	Jan. 13, 2012	Nov. 30, 2012	Jul. 31, 2012	Nov. 30, 2011	Feb. 28, 2013	Nov. 30, 2012	Feb. 28, 2013
Number outstanding						7,465,000	6,083,000	6,083,000
Weighted average exercise price per share (in Dollars per share)						$ 71.39	$ 64.76	$ 64.76
Balance at February 28, 2013			7,465,000			7,089,000	7,465,000	7,089,000
Balance at February 28, 2013 (in Dollars per share)			$ 71.39			$ 73.03	$ 71.39	$ 73.03
Granted, Number outstanding	18,781	20,976	1,011,510	241,546	665,551			1,656,185
Exercised, Number outstanding						(390,000)	(253,000)
Exercised, Weighted average exercise price per share (in Dollars per share)						$ 42.44	$ 46.79
Forfeited, Number outstanding						(14,000)	(12,000)
Forfeited, Weighted average exercise price per share (in Dollars per share)						$ 88.63	$ 85.28
Non-Performance Based [Member]
Granted, Number outstanding						9,000	635,000
Granted, Weighted average exercise price per share (in Dollars per share)						$ 92.55	$ 92.22
Performance Based [Member]
Granted, Number outstanding						19,000	1,012,000
Granted, Weighted average exercise price per share (in Dollars per share)						$ 91.06	$ 92.22