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Note 15 - Employee Stock Option and Retirement Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Dec. 19, 2017
Jun. 30, 2017
Oct. 16, 2015
Nov. 01, 2013
Apr. 08, 2013
Nov. 08, 2010
Jun. 30, 2017
Jan. 31, 2017
Aug. 31, 2018
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Feb. 28, 2016
Nov. 30, 2015
Feb. 28, 2015
Jul. 31, 2016
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Aug. 30, 2016
Aug. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance                 3,143,000       3,366,000       3,364,000           3,366,000 3,143,000 3,366,000 3,364,000   3,117,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance                 $ 153.05       $ 139.29       $ 129.54           $ 139.29 $ 153.05 $ 139.29 $ 129.54   $ 100.71
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total                 $ 71,700,000                             $ 71,700,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                                               3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   0                                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                                               $ 190.42 $ 156.77 $ 168.55    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value                 $ 105,297,000                             $ 105,297,000        
Share Price                 $ 229.39                             $ 229.39        
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                                               64,230 75,372      
Stock Issued During Period Employee Stock Purchase Plans Weighted Average Price Per Share                 $ 160.34       136.34                   $ 136.34 $ 160.34 $ 136.34      
Common Stock, Capital Shares Reserved for Future Issuance                 268,942                             268,942        
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                                               $ 11,600,000 $ 10,100,000 $ 9,700,000    
Employee Stock Option [Member]                                                        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                 $ 200.20   $ 192.11 $ 189.98 $ 165.75 $ 163.05 $ 169.16 $ 152.51 $ 171.22 $ 152.10 $ 150.81 $ 170.21                
Performance Shares [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 16,512           61,744 22,460               17,000 291,000 551,000    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                                               $ 200.20 $ 166.29 $ 165.59    
Performance Shares [Member] | Code Red, Inc. [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                                         4 years              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total                 $ 400,000                             $ 400,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                                               146 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                                         68,761              
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                 2,536 0 0 961 49,473 0 7,843 5,084 3,944 255 0 93,120       3,497 62,400 97,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                 $ 191.97     $ 182.17 $ 158.46   $ 161.31 $ 151.63 $ 164.77 $ 146.20   $ 159.46       $ 189.28 $ 158.26 $ 159.64    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance                 143,000       182,000       262,000           182,000 143,000 182,000 262,000   313,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                                             132,194 26,599 132,000 [1] 69,000 [2]    
Restricted Stock [Member] | Market Research Business [Member] | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                                           17,482            
Restricted Stock [Member] | Market Research Business [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                                               8,234        
LTIP [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 5,750,000                                             5,750,000        
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, Outstanding, Number, Ending Balance                 3,143,417                             3,143,417        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance                 $ 153.05                             $ 153.05        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total                 $ 59,700,000                             $ 59,700,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                                               3 years 36 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                                               610,628 1,026,984 1,195,649    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                                               $ 190.65 $ 157.09 $ 168.14    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value                 105,300,000       $ 49,700,000                   $ 49,700,000 $ 105,300,000 $ 49,700,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term                                               5 years 219 days 5 years 36 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value                                               $ 50,100,000 $ 38,000,000 $ 60,800,000    
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       3 years                                                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total                 $ 12,000,000                             $ 12,000,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                                               3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%   60.00% 20.00% 40.00%                                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   8,600 9,765 73,522 14,683 37,079                                   3,497 62,400 97,319    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                                               $ 189.28 $ 158.26 $ 159.64    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance                 143,003                             143,003        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                                               26,599 132,194   69,244  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share Equivalent                 2.5                             2.5        
LTIP [Member] | Restricted Stock [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                                                 11,182      
LTIP [Member] | Restricted Stock [Member] | Share-based Compensation Award, Tranche One [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     17,328                                                  
LTIP [Member] | Restricted Stock [Member] | Share-based Compensation Award, Tranche Two [Member]                                                        
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     30,162                                                  
[1] The 132,194 restricted stock awards that vested during fiscal 2017 were comprised of: 73,522 of awards relating to restricted stock granted on November 1, 2013, which cliff vested 60% after three years, 17,328 of awards relating to restricted stock granted on October 16, 2015, which vested 20% annually upon the anniversary date of the grant and 30,162 of awards relating to restricted stock granted on October 16, 2015, which were modified to accelerate vest 100% in conjunction with employee severance. Additionally, 11,182 awards vested related to other grants.
[2] The 69,244 restricted stock awards that vested during fiscal 2016 were comprised of: 37,079 of awards relating to restricted stock granted on November 8, 2010 (remaining 40%) and 14,683 restricted stock awards that were granted on April 8, 2013, which cliff vest 20% annually upon the anniversary date of the grant. Additionally, 17,482 awards vested related to other grants.