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STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - BONUS SHARE PROGRAM (Details) - USD ($)
$ in Millions
Oct. 31, 2018
Jan. 31, 2018
Combined Stock Bonus Program and Bonus Share Program    
Stock-Based Compensation Plans    
Total accrued liability $ 6.6 $ 9.2
2018 Plan | Bonus Share Program    
Stock-Based Compensation Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 300,000  
2019 Plan | Bonus Share Program    
Stock-Based Compensation Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 300,000