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Share-Based Compensation Plans (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 22, 2018
shares
Feb. 28, 2019
USD ($)
Plan
$ / shares
shares
Feb. 28, 2018
USD ($)
$ / shares
shares
Feb. 28, 2017
USD ($)
$ / shares
shares
Feb. 29, 2016
shares
Share-based compensation plans          
Number Of Expired Share Based Compensation Plans | Plan   4      
Number of active share-based compensation plans | Plan   2      
Share-Based Compensation Arrangement By Share Based Payment Award, Stocks Purchased Under Employee Purchase Plan   17,435      
Shares purchased for 2018 ESPP   14,222      
Maximum withholding percentage of employee wages or salaries for the purchase of shares of common stock 15.00%        
Purchase price for shares acquired under the plan as a percentage of the share's fair market value   85.00%      
Employee Stock Option And Restricted Stock Plan1998          
Share-based compensation plans          
Options exercisable   0      
2008 Stock Incentive Plan          
Share-based compensation plans          
Options outstanding   162,938      
Share-Based Compensation Arrangemnt By Share-Based Payment Award, Restricted Stock Units That May Be Settled for Common Stock   539,122      
The 2018 Plan          
Share-based compensation plans          
Number of shares of common stock covered for issuance under share-based compensation plan 2,000,000        
Shares issued under 2008 Directors' Plan (in shares)   2,128      
Certain Officers And Employees | 2008 Directors Plan          
Share-based compensation plans          
Options outstanding   0      
Stock options          
Share-based compensation plans          
Options exercisable   126,000      
Options outstanding   163,000 300,000 448,000 649,000
Options granted (in shares)   0 0 2,000  
Stock options | Certain Officers And Employees | Employee Stock Option And Restricted Stock Plan1998          
Share-based compensation plans          
Options outstanding   0      
Restricted Stock Units (RSU) | 2008 Stock Incentive Plan          
Share-based compensation plans          
Options outstanding   351,750      
Grant date fair value (in usd per share) | $ / shares   $ 84.02 $ 96.44 $ 96.90  
Restricted Stock Units (RSU) | The 2018 Plan          
Share-based compensation plans          
Grant date fair value (in usd per share) | $ / shares   $ 125.40 $ 0.00 $ 0.00  
Restricted Stock Units (RSU) | Directors | 2008 Directors Plan          
Share-based compensation plans          
Shares issued under 2008 Directors' Plan (in shares)   2,737 5,658 5,285  
Aggregate grant date fair value of shares issued (in usd per share) | $   $ 0.2 $ 0.5 $ 0.5  
Grant date fair value (in usd per share) | $ / shares   $ 89.77 $ 92.95 $ 92.98  
Restricted Stock Units (RSU) | Directors | The 2018 Plan          
Share-based compensation plans          
Shares issued under 2008 Directors' Plan (in shares)   2,128 0 0  
Aggregate grant date fair value of shares issued (in usd per share) | $   $ 0.3      
Grant date fair value (in usd per share) | $ / shares   $ 131.7      
Maximum          
Share-based compensation plans          
Shares purchased for 2018 ESPP 750,000