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Note 13 - Employee Stock Option and Retirement Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 12, 2018
Dec. 19, 2017
Jan. 13, 2017
Jun. 30, 2017
Jan. 31, 2017
Feb. 28, 2018
Nov. 30, 2017
Feb. 28, 2017
Nov. 30, 2016
Feb. 28, 2015
Feb. 28, 2018
Feb. 28, 2017
Aug. 31, 2017
Aug. 31, 2008
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price           $ 192.11   $ 169.16     $ 190.04 $ 153.87    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number           3,402,000 3,669,000       3,402,000   3,366,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price           $ 151.15 $ 149.09       $ 151.15   $ 139.29  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized           $ 85,900,000         $ 85,900,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                     3 years 146 days      
Share Price           $ 203.18         $ 203.18   $ 157.18  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent   85.00%                        
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate   10.00%                        
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Contribution Limit   $ 25,000                        
Stock Issued During Period, Shares, Employee Stock Purchase Plans           14,805   20,744     34,394 37,240    
Treasury Stock Acquired, Average Cost Per Share           $ 171.23   $ 135.48     $ 150.25 $ 135.77    
Common Stock, Capital Shares Reserved for Future Issuance           298,778         298,778      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent                     60.00%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay                     4.00%      
Defined Contribution Plan, Employer Matching Contribution, Vesting Period                     5 years      
Defined Contribution Plan, Employer Discretionary Contribution Amount                     $ 5,500,000 $ 4,600,000    
Employee Stock Option [Member]                            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price               $ 169.16 $ 152.51          
Performance Shares [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross               61,744 22,460          
Performance Shares [Member] | Code Red, Inc. [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                   4 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   68,761        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized           $ 300,000         $ 300,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                     328 days      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                   40.00%        
Performance Shares [Member] | Vermilion Holdings Limited [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         61,744                  
Performance Shares [Member] | Vermilion Holdings Limited [Member] | Share-based Compensation Award, Tranche One [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         40.00%           0.00%      
Performance Shares [Member] | Vermilion Holdings Limited [Member] | Share-based Compensation Award, Tranche Two [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         20.00%           100.00%      
Performance Shares [Member] | BI-SAM Technologies [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       206,417                    
Performance Shares [Member] | BI-SAM Technologies [Member] | Share-based Compensation Award, Tranche One [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       40.00%             0.00%      
Performance Shares [Member] | BI-SAM Technologies [Member] | Share-based Compensation Award, Tranche Two [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       20.00%             80.00%      
Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           961   12,927          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 182.17   $ 157.50          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number           155,000 162,000       155,000   182,000  
LTIP [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   5,750,000       5,750,000 [1],[2]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value           $ 17,200,000   $ 14,100,000     $ 35,200,000 30,500,000    
LTIP [Member] | Employee Stock Option [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                     569,305      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                     $ 190.04      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number           3,401,562         3,401,562      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price           $ 151.15         $ 151.15      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized           $ 70,800,000         $ 70,800,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                     3 years 182 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number           1,100,000         1,100,000   900,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price           $ 122.44         $ 122.44   $ 105.14  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value           $ 89,400,000         $ 89,400,000   $ 49,700,000  
LTIP [Member] | Employee Stock Option [Member] | Maximum [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years                        
LTIP [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                     5 years      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized           $ 15,100,000         $ 15,100,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                     3 years 36 days      
Share Price           $ 203.18         $ 203.18   $ 157.18  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                     961      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                     $ 182.17      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number           155,113         155,113      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested           $ 31,500,000         $ 31,500,000   $ 28,600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Pre-Tax Intrinsic Value           $ 700,000   $ 1,100,000     $ 2,700,000 $ 15,600,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share Equivalent               2.5       2.5    
Director Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   250,000       250,000 [1],[2]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 18,963   23,846     19,000                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price           $ 197.75                
Common Stock, Capital Shares Reserved for Future Issuance                           250,000
[1] On December 19, 2017, the Company's stockholders approved the Director Plan. As part of the approval, an additional 250,000 shares of commons stock were added to the Director Plan share reserve.
[2] On December 19, 2017, the Company's stockholders approved the LTIP. As part of the approval, an additional 5,750,000 shares of common stock were added to the LTIP’s share reserve.