Note 14 - Stock-Based Compensation (Tables)

9 Months Ended

May 31, 2014

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

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

	Nine Months Ended May 31,
	2014			2013
Term structure of risk-free interest rate		0.01% - 2.61	%		0.16% - 1.91	%
Expected life (in years)	7.6 – 7.8			7.6 – 7.8
Term structure of volatility		23% - 33	%		24% - 33	%
Dividend yield		1.35	%		1.30	%
Weighted average estimated fair value	$	29.64		$	26.87
Weighted average exercise price	$	106.69		$	92.22
Fair value as a percentage of exercise price		27.8	%		29.1	%

Non-Employee Stock Option Plan [Member]

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

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

Risk-free interest rate	1.66	%
Expected life (in years)	5.4
Expected volatility	28.9	%
Dividend yield	1.35	%

Risk-free interest rate	0.89	%
Expected life (in years)	5.4
Expected volatility	32.3	%
Dividend yield	1.30	%

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 May 31,
	2014			2013
Risk-free interest rate		0.04	%		0.06	%
Expected life (in months)		3			3
Expected volatility		13.3	%		10.4	%
Dividend yield		1.50	%		1.44	%

	Nine Months Ended May 31,
	2014			2013
Risk-free interest rate		0.04	%		0.08	%
Expected life (in months)		3			3
Expected volatility		10.8	%		9.9	%
Dividend yield		1.36	%		1.36	%