Note 14 - Stock-Based Compensation (Details) (USD $)	0 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended			9 Months Ended		12 Months Ended	3 Months Ended				9 Months Ended	3 Months Ended										3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Jan. 15, 2014	Jan. 15, 2013	Jul. 31, 2012	May 31, 2014	May 31, 2014	May 31, 2013	Dec. 16, 2008	May 31, 2014 Performance Based [Member] StreetAccount [Member]	May 31, 2014 Performance Based [Member] Market Metrics [Member]	Aug. 31, 2013 Performance Based [Member] Market Metrics [Member]	Feb. 28, 2014 Performance Based [Member]	Nov. 30, 2013 Performance Based [Member]	May 31, 2013 Performance Based [Member]	Nov. 30, 2012 Performance Based [Member]	May 31, 2013 Performance Based [Member]	Feb. 28, 2014 Non-Performance Based [Member]	Nov. 30, 2013 Non-Performance Based [Member]	Feb. 28, 2013 Non-Performance Based [Member]	Nov. 30, 2012 Non-Performance Based [Member]	May 31, 2014 Performance and Non-Performance [Member]	Feb. 28, 2014 Performance and Non-Performance [Member]	Nov. 30, 2013 Performance and Non-Performance [Member]	May 31, 2013 Performance and Non-Performance [Member]	Nov. 30, 2012 Performance and Non-Performance [Member]	May 31, 2014 Non-Employee Directors' Stock Option Plan [Member]	May 31, 2014 Employee Stock Purchase Plan [Member]	May 31, 2013 Employee Stock Purchase Plan [Member]	May 31, 2014 Employee Stock Purchase Plan [Member]	May 31, 2013 Employee Stock Purchase Plan [Member]	May 31, 2014 Employee Stock Purchase Plan [Member]	May 31, 2014 Employee Stock Purchase Plan [Member]
Note 14 - Stock-Based Compensation (Details) [Line Items]
Allocated Share-based Compensation Expense (in Dollars)								$ 1,400,000		$ 15,700,000			$ 5,400,000		$ 31,800,000											$ 300,000	$ 300,000			$ 6,800,000	$ 17,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)				2,800,000	2,800,000				54,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				4 years 109 days					3 years 6 months
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount (in Dollars)					$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	14,424	18,781	241,546		391,478						165,949	36,695		1,011,510		138,902	35,508	9,367	635,308	0			0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price					$ 106.73													$ 92.55			$ 106.03	$ 109.49		$ 92.22		$ 88.55	$ 82.67	$ 88.33	$ 79.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 27.04	$ 24.23																$ 26.69			$ 29.14	$ 31.78		$ 26.87		$ 17.81	$ 16.15	$ 17.91	$ 15.65
Common Stock, Capital Shares Reserved for Future Issuance (in Shares)							500,000																		250,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)					562,000	1,775,000																				18,068	16,739	54,597	56,230