Note 14 - Stock-based Compensation (Details) - Summary of Stock Option Weighted Average Assumptions of Employee Stock Options - $ / shares	3 Months Ended			9 Months Ended
	May. 31, 2015	Nov. 30, 2014	May. 31, 2014	May. 31, 2015	May. 31, 2014
Note 14 - Stock-based Compensation (Details) - Summary of Stock Option Weighted Average Assumptions of Employee Stock Options [Line Items]
Weighted average exercise price (in Dollars per share)	$ 159.14	$ 131.31
Employee Stock Option [Member]
Note 14 - Stock-based Compensation (Details) - Summary of Stock Option Weighted Average Assumptions of Employee Stock Options [Line Items]
Term structure of risk-free interest rate
Expected life (in years)	8 years 73 days			8 years 73 days
Term structure of volatility
Dividend yield	1.16%			1.33%	1.35%
Weighted average estimated fair value (in Dollars per share)	$ 44.95			$ 39.59	$ 29.64
Weighted average exercise price (in Dollars per share)	$ 159.14			$ 137.52	$ 106.69
Fair value as a percentage of exercise price	28.20%			28.80%	27.80%
Minimum [Member] | Employee Stock Option [Member]
Note 14 - Stock-based Compensation (Details) - Summary of Stock Option Weighted Average Assumptions of Employee Stock Options [Line Items]
Term structure of risk-free interest rate	0.01%			0.01%	0.01%
Expected life (in years)					7 years 219 days
Term structure of volatility	21.00%			21.00%	23.00%
Maximum [Member] | Employee Stock Option [Member]
Note 14 - Stock-based Compensation (Details) - Summary of Stock Option Weighted Average Assumptions of Employee Stock Options [Line Items]
Term structure of risk-free interest rate	2.12%			2.34%	2.61%
Expected life (in years)					7 years 292 days
Term structure of volatility	31.00%			31.00%	33.00%