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Share-Based Compensation Plans - RSA, RSU Activity and unrecognized share based compensation expense (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 22, 2014
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Feb. 28, 2014
Stock Option Officers Employees and Consultants          
UNRECOGNIZED SHARE-BASED COMPENSATION EXPENSE          
Unrecognized Compensation Expense   $ 3,578      
Weighted Average Period of Recognition   25 months 12 days      
Restricted Stock Units (RSU)          
Shares          
Outstanding at the beginning of the period (in shares)   213,000 118,000 100,000  
Granted/Earned (in shares)   162,000 95,000 118,000  
Vested (in shares)   (15,643)   (100,000)  
Vested or forfeited (in shares)   (53,000)      
Outstanding at the end of the period (in shares)   322,000 213,000 118,000 100,000
Weighted Average Grant Date Fair Value (per share)          
Outstanding at the beginning of the period (in dollars per share)   $ 66.50 $ 58.35 $ 32.88  
Grant date fair value (in dollars per share)   96.90 76.62 58.35  
Vested in period, fair value at award date (in dollars per share)   60.28   32.88  
Vested or forfeited (in dollars per share)   70.14      
Outstanding at the end of the period (in dollars per share)   $ 81.19 $ 66.50 $ 58.35 $ 32.88
Fair Value Outstanding          
Fair value outstanding   $ 31,418 $ 20,311 $ 9,041 $ 6,531
Vested and settled          
Vested in period, fair value at award date (in dollars per share)   $ 60.28   $ 32.88  
Restricted Stock Units and Performance Stock Units          
UNRECOGNIZED SHARE-BASED COMPENSATION EXPENSE          
Unrecognized Compensation Expense   $ 10,804      
Weighted Average Period of Recognition   23 months 15 days      
2008 Stock Incentive Plan | Restricted stock (RSA)          
Shares          
Outstanding at the beginning of the period (in shares)   2,000   62,000  
Vested (in shares)     (2,000) (62,000)  
Outstanding at the end of the period (in shares)     2,000   62,000
Weighted Average Grant Date Fair Value (per share)          
Outstanding at the beginning of the period (in dollars per share)   $ 89.12   $ 67.10  
Grant date fair value (in dollars per share)     $ 89.12 $ 67.10  
Outstanding at the end of the period (in dollars per share)     $ 89.12   $ 67.10
Fair Value Outstanding          
Fair value outstanding         $ 4,073
2008 Stock Incentive Plan | Restricted stock (RSA) | Former Chief Executive Officer          
Shares          
Vested (in shares)         (62,304)
Weighted Average Grant Date Fair Value (per share)          
Vested in period, fair value at award date (in dollars per share)   67.10      
Vested and settled          
Vested in period, fair value at award date (in dollars per share)   $ 67.10      
2008 Stock Incentive Plan | Performance Restricted Stock Units (PSU)          
Shares          
Granted/Earned (in shares)   139,846 130,608 178,101  
Weighted Average Grant Date Fair Value (per share)          
Grant date fair value (in dollars per share)   $ 97.12 $ 76.62 $ 58.36  
Vested in period, fair value at award date (in dollars per share) $ 67.10        
Vested and settled          
Vested in period, fair value at award date (in dollars per share) $ 67.10