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Restructuring Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Feb. 29, 2020
Restructuring Plan          
Restructuring charges $ 12 $ 25 $ 1,061 $ 2,609  
Cash restructuring payments for the reporting period 300   1,800    
Project Refuel          
Restructuring Plan          
Restructuring charges     1,100    
Incurred pre-tax restructuring costs 6,500   6,500    
Cash restructuring payments to date     6,000    
Restructuring liability $ 500   500    
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