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Note 13 - Employee Stock Option and Retirement Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 09, 2019
Dec. 19, 2017
Nov. 01, 2013
Jun. 30, 2017
May 31, 2019
Feb. 28, 2019
Nov. 30, 2018
May 31, 2018
May 31, 2019
May 31, 2018
Aug. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         2,866 3,216 3,457   2,866   3,143
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance         $ 167,000 $ 164,420 $ 162,680   $ 167,000   $ 153,050
Share Price         $ 278.20       $ 278.20    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         2   455        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 80,000,000       $ 80,000,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                 3 years 36 days    
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%       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         13,350     16,312 39,069 50,706  
Treasury Stock Acquired, Average Cost Per Share         $ 201.54     $ 170.86 $ 199.43 $ 156.88  
Common Stock, Capital Shares Reserved for Future Issuance         229,873       229,873    
Defined Contribution Plan, Employer Discretionary Contribution Amount         $ 3,000,000     $ 3,000,000 $ 8,200,000 $ 8,500,000  
LTIP [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 32,100,000     5,200,000 $ 58,400,000 $ 40,300,000  
Share-based Payment Arrangement, Option [Member] | LTIP [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, Outstanding, Number, Ending Balance         463,033       463,033    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance         $ 221.97       $ 221.97    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number         900,000       900,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price         $ 138.85       $ 138.85    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         $ 131,200,000       $ 131,200,000   $ 105,300,000
Share-based Payment Arrangement, Option [Member] | LTIP [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years                  
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 Payment Arrangement, Tranche One [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       40.00%              
Performance Shares [Member] | BI-SAM Technologies [Member] | Share-based Payment Arrangement, Tranche Two [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       20.00%              
Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 41,418    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         41,000     961  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 212.66   $ 212.94 $ 182.17  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance         104,000 107,000 131,000   104,000   143,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period         23,000 [1] 52,000 [2]   75,530 15,063  
Restricted Stock [Member] | LTIP [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                 5 years    
Share Price         $ 278.20       $ 278.20   $ 229.39
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                 41,418    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                 $ 212.94    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance         104,136       104,136    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 14,900,000       $ 14,900,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                 3 years 146 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested         $ 29,000,000       $ 29,000,000   $ 32,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period         0            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Pre-Tax Intrinsic Value               $ 100,000 $ 16,700,000 $ 2,800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share Equivalent         2.5       2.5    
Restricted Stock [Member] | LTIP [Member] | Share-based Payment Arrangement, Tranche One [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     60.00%                
Restricted Stock [Member] | LTIP [Member] | Share-based Payment Arrangement, Tranche Two [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     40.00%                
[1] The majority of the vested restricted stock awards related to the final vesting of awards granted on February 9, 2015, which vested 100% on the four year anniversary date of the grant.
[2] The majority of the vested restricted stock awards related to the final vesting of awards granted on November 1, 2013, which cliff vested 60% after three years on November 1, 2016 and 40% after five years on November 1, 2018.