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Share-Based Compensation Plans Share-Based Compensation Plans - Summary of shares available for issue (Details) - The 2018 Plan - shares
12 Months Ended
Feb. 28, 2019
Aug. 22, 2018
Share-based compensation plans    
Shares originally authorized   2,000,000
Less share awards issued (2,128)  
Plus forfeitures 4,300  
Less share awards previously vested and settled 0  
Subtotal 2,002,172  
Shares available for issuance 1,923,619  
Restricted Stock Units (RSU)    
Share-based compensation plans    
Less shares issuable upon vesting 78,553  
Performance Restricted Stock Units (PSU)    
Share-based compensation plans    
Less shares issuable upon vesting 0