Note 13 - Employee Stock Option and Retirement Plans (Details) (USD $)	0 Months Ended		1 Months Ended	3 Months Ended					9 Months Ended					3 Months Ended	9 Months Ended					9 Months Ended		0 Months Ended			3 Months Ended	9 Months Ended					3 Months Ended			9 Months Ended					3 Months Ended		1 Months Ended	9 Months Ended
	Jan. 15, 2014	Jan. 15, 2013	Jul. 31, 2012	May 31, 2014		Feb. 28, 2014	Nov. 30, 2013	May 31, 2013	May 31, 2014	May 31, 2013	Dec. 16, 2008	May 31, 2014 In-The-Money Stock Options [Member]	Aug. 31, 2013 In-The-Money Stock Options [Member]	May 31, 2014 July 2012 Performance Based Option Grant Review [Member]	May 31, 2014 Other Performace-Based Options [Member] Matrix Data Limited [Member]	May 31, 2014 Other Performace-Based Options [Member] Revere Data, LLC [Member]	May 31, 2014 Other Performace-Based Options [Member]	May 31, 2014 Restricted Stock [Member] After Three Years [Member]	May 31, 2014 Restricted Stock [Member] After Five Years [Member]	May 31, 2014 Restricted Stock [Member] Matrix Data Limited [Member]	May 31, 2014 Restricted Stock [Member] Revere Data, LLC [Member]	Nov. 02, 2013 Restricted Stock [Member]	Apr. 08, 2013 Restricted Stock [Member]	Apr. 14, 2011 Restricted Stock [Member]	May 31, 2014 Restricted Stock [Member]	May 31, 2014 Restricted Stock [Member]	May 31, 2013 Restricted Stock [Member]	Apr. 14, 2014 Restricted Stock [Member]	May 31, 2014 Other Restricted Stock Awards [Member] After Three Years [Member]	May 31, 2014 Other Restricted Stock Awards [Member] After Five Years [Member]	May 31, 2014 Other Restricted Stock Awards [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 Granted Without Performance Conditions [Member] Minimum [Member]	May 31, 2014 Granted Without Performance Conditions [Member] Maximum [Member]	May 31, 2014 Majority of Options Granted with Performance Conditions [Member] Maximum [Member]	May 31, 2014 Employee Stock Option [Member]	May 31, 2014 Matrix and Revere [Member]	Nov. 30, 2012 November 2012 Annual Employee Performance-based Option Grant Review [Member]	May 31, 2014 November 2012 Annual Employee Performance-based Option Grant Review [Member]	May 31, 2014 Employee Stock Purchase Plan [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) [Line Items]
Stock Option Expiration Term																																				7 years	10 years	10 years
Stock Option Vesting Rate After First Year of Grant Date									20.00%
Stock Option Vesting Rate Per Month from Two Years through Five Years of Grant Date									1.67%
Stock Option Vesting Rate for First Two Years for Grant Date									40.00%
Stock Option Vesting Rate Per Month from Three Years through Five Years									1.67%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	14,424	18,781	241,546						391,478						165,949	36,695							26,344																		1,011,510
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)									$ 106.73																							$ 88.55	$ 82.67	$ 88.33	$ 79.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number												2,100,000	1,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in Dollars per share)												$ 66.34	$ 59.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value (in Dollars)												$ 86,300,000	$ 82,100,000
Share-Based Compensation Arrangement by Share-Based Payment Award Options Closing Share Price (in Dollars per share)				$ 107.14					$ 107.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)				6,900,000				31,400,000	22,900,000	61,500,000
Percent of Performance-Based Stock Options Expected to Vest																																										20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number																18,553					3,872																					202,302
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)				2,800,000					2,800,000					1,200,000		500,000									12,000,000	12,000,000					1,000,000									300,000		2,500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				4 years 109 days										3 years 109 days			4 years 73 days									4 years 146 days					4 years 255 days									4 years 219 days		3 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost (in Dollars)																																							1,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				55,000	[1]	17,000	63,000																		55,431	204,124	148,969
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)						$ 100.70	$ 102.27															$ 102.22				$ 101.95
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						42,000	162,000													30,144	7,744	153,972		29,087		12,264
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value (in Dollars per share)				$ 93.12	[1]	$ 60.28	$ 83.49																	$ 103.30
Vesting Percentage																		60.00%	40.00%									100.00%	60.00%	40.00%
Common Stock, Capital Shares Reserved for Future Issuance											500,000																																65,173
Stock Issued During Period, Shares, Employee Stock Purchase Plans									562,000	1,775,000																						18,068	16,739	54,597	56,230								54,597
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)																																$ 88.55	$ 82.67		$ 79.77								$ 88.33
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars)									$ 5,700,000	$ 5,500,000

[1] Of the total 55,431 restricted stock awards that vested during the third quarter of fiscal 2014, 29,087 related to awards granted on April 14, 2011 at the grant date price of $103.30. These restricted stock awards cliff vested 100% after three years on April 14, 2014. The awards were amortized to expense over the vesting period using the straight-line attribution method. The remaining 26,344 restricted stock awards that vested during the third quarter were granted on April 8, 2013 and cliff vest 20% annually upon each anniversary date of the grant.