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Earnings Per Share - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 17 Months Ended 28 Months Ended
Apr. 06, 2021
Feb. 28, 2021
Nov. 30, 2020
Aug. 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
Feb. 28, 2021
Feb. 29, 2020
Apr. 07, 2021
Feb. 28, 2021
Oct. 29, 2019
Oct. 30, 2018
Earnings Per Share [Abstract]                          
Basic earnings per share from discontinued operations (in dollars per share)   $ 0.00     $ 0.00     $ 0.00 $ 0.00        
Diluted earnings per share from discontinued operations (in dollars per share)   $ 0.00     $ 0     $ 0.00 $ 0        
Options granted and excluded from the computation of diluted earnings per share (in shares)   100     100     200 200        
Equity, Class of Treasury Stock [Line Items]                          
Stock purchased under share buyback   $ 83,108,000 $ 2,371,000 $ 69,011,000 $ 2,586,000 $ 1,911,000 $ 256,830,000            
Shares acquired for employee payroll taxes on restricted stock awards (in shares)   100     100     200 300        
Shares acquired for employee payroll taxes on restricted stock awards, average price (in dollars per share)   $ 332.73     $ 278.21     $ 301.49 $ 261.48        
Shares acquired for employee payroll taxes on restricted stock awards   $ 1,200,000     $ 2,500,000     $ 72,500,000 $ 68,400,000        
Share Buyback Programs                          
Equity, Class of Treasury Stock [Line Items]                          
Stock purchased under share buyback (shares)   256     0     256 837        
Stock purchased under share buyback, average price (in dollars per share)   $ 320.30     $ 0     $ 320.30 $ 230.66        
Stock purchased under share buyback   $ 81,957,000     $ 0     $ 81,957,000 $ 193,109,000        
October 30, 2018 Plan                          
Equity, Class of Treasury Stock [Line Items]                          
Share buyback program, authorized amount                         $ 1,000,000,000.0
Stock purchased under share buyback (shares)   190     0     190 837   4,500    
Stock purchased under share buyback, average price (in dollars per share)   $ 319.88     $ 0     $ 319.88 $ 230.66   $ 223.68    
Stock purchased under share buyback   $ 60,877,000     $ 0     $ 60,877,000 $ 193,109,000   $ 1,000,000,000.0    
October 29, 2019 Plan                          
Equity, Class of Treasury Stock [Line Items]                          
Share buyback program, authorized amount                       $ 1,000,000,000.0  
Stock purchased under share buyback (shares)   66     0     66 0        
Stock purchased under share buyback, average price (in dollars per share)   $ 321.51     $ 0     $ 321.51 $ 0        
Stock purchased under share buyback   $ 21,080,000     $ 0     $ 21,080,000 $ 0        
Subsequent Event | Share Buyback Programs                          
Equity, Class of Treasury Stock [Line Items]                          
Stock purchased under share buyback (shares) 100                        
Stock purchased under share buyback, average price (in dollars per share) $ 337.39                        
Stock purchased under share buyback $ 8,000,000.0                        
Subsequent Event | October 29, 2019 Plan                          
Equity, Class of Treasury Stock [Line Items]                          
Stock purchased under share buyback (shares)                   100      
Stock purchased under share buyback, average price (in dollars per share)                   $ 325.71      
Stock purchased under share buyback                   $ 29,100,000