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Share-Based Compensation Plans - Summary of Shares Available for Issue (Details) - The 2018 Plan - shares
12 Months Ended
Feb. 29, 2020
Aug. 22, 2018
Share-based compensation plans    
Shares originally authorized (in shares)   2,000,000
Less share awards issued (in shares) (6,464)  
Plus forfeitures (in shares) 32,126  
Less share awards previously vested and settled (in shares) 0  
Subtotal (in shares) 2,025,662  
Shares available for issuance (in shares) 1,643,328  
Restricted Stock Units (RSU)    
Share-based compensation plans    
Less shares issuable upon vesting (in shares) (259,932)  
Performance Stock Awards    
Share-based compensation plans    
Less shares issuable upon vesting (in shares) (122,402)