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Restructuring Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 41 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Feb. 28, 2021
Restructuring Plan          
Restructuring charges $ (12) $ 12 $ 355 $ 1,061  
Cash restructuring payments for the reporting period 200 $ 300 900 $ 1,800  
Project Refuel          
Restructuring Plan          
Restructuring charges     400    
Incurred pre-tax restructuring costs 9,100   9,100    
Cash restructuring payments to date     8,900    
Restructuring liability $ 200   $ 200    
Scenario, Forecast | Project Refuel          
Restructuring Plan          
Expected restructuring costs         $ 9,500
Scenario, Forecast | Minimum | Project Refuel          
Restructuring Plan          
Targeted annualized profit improvement         9,000
Scenario, Forecast | Maximum | Project Refuel          
Restructuring Plan          
Targeted annualized profit improvement         $ 11,000