Note 14 - Stock-based Compensation (Tables)

3 Months Ended

Nov. 30, 2014

Note 14 - Stock-based Compensation (Tables) [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Q1 2015			Q1 2014
Term structure of risk-free interest rate		0.06% - 2.34	%		0.08% - 2.61	%
Expected life (in years)		8.2		7.6 – 7.8
Term structure of volatility		21% - 31	%		23% - 33	%
Dividend yield		1.37	%		1.35	%
Weighted average estimated fair value	$	37.67		$	31.78
Weighted average exercise price	$	131.31		$	109.49
Fair value as a percentage of exercise price		28.7	%		29.0	%

Employee Stock Purchase Plan [Member]

Note 14 - Stock-based Compensation (Tables) [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended November 30,
	2014			2013
Risk-free interest rate		0.02	%		0.04	%
Expected life (in months)		3			3
Expected volatility		8.52	%		8.66	%
Dividend yield		1.22	%		1.37	%