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Restructuring Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May 31, 2019
May 31, 2018
Feb. 29, 2020
Restructuring Plan      
Restructuring charges $ 619 $ 1,725  
Project Refuel      
Restructuring Plan      
Restructuring charges 600    
Incurred pre-tax restructuring costs 6,000    
Total cash restructuring payments 700    
Restructuring Reserve 1,200    
Cash restructuring payments since implementation 4,900    
Minimum | Project Refuel      
Restructuring Plan      
Targeted annualized profit improvement 8,000    
Maximum | Project Refuel      
Restructuring Plan      
Targeted annualized profit improvement $ 10,000    
Scenario, Forecast | Project Refuel      
Restructuring Plan      
Restructuring charges     $ 7,000