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Note 17 - Stock-based Compensation Plans Summary of Performance Share Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Vested or expected to vest, shares (in shares) 1,147,720    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 33.77    
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 328 days    
Vested or expected to vest, aggregate intrinsic value $ 28.1    
Performance Shares [Member]      
Number of Units Outstanding (in shares) 629,874 530,383  
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 21.19 $ 18.02  
Weighted-Average Remaining Contractual, PSU (Year) 4 years 255 days 5 years 5 years 182 days
Aggregate Intrinsic Value, PSU $ 44.0 $ 28.2 $ 16.6
Number of PSUs Granted (in shares) 85,334 53,729  
PSUs Granted, Weighted-Average Granted Date Fair Value (in dollars per share) $ 54.24 $ 53.65  
Performance units issued (in shares) 40,665 45,762  
Performance units issued, weighted-average granted date fair value (in dollars per share) $ 29.08 $ 23.24  
Number of Units Outstanding (in shares) 755,873 629,874 530,383
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 25.17 $ 21.19 $ 18.02
Vested or expected to vest, shares (in shares) 755,873    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 25.17    
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 255 days    
Vested or expected to vest, aggregate intrinsic value $ 44.0    
Exercisable, number of units (in shares) 562,459    
Exercisable, PSU weighted-average granted date fair value (in dollars per share) $ 17.21    
Exercisable, Weighted-Average Remaining Contractual, PSU (Year) 3 years 182 days    
Exercisable, Aggregate Intrinsic Value, PSU $ 32.8