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Restructuring Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 28, 2019
Nov. 30, 2018
Aug. 31, 2018
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Restructuring Plan                        
Restructuring charges $ 977 $ 25 $ 859 $ 1,725 $ 692 $ 1,165 $ 0 $ 0   $ 3,586 $ 1,857 $ 0
Project Refuel                        
Restructuring Plan                        
Restructuring charges to date 5,400                 5,400    
Cash restructuring payments                   3,100    
Restructuring liability $ 1,200                 1,200    
Cash restructuring payments to date                   4,200    
Minimum | Project Refuel                        
Restructuring Plan                        
Targeted annualized profit improvement                   8,000    
Maximum | Project Refuel                        
Restructuring Plan                        
Targeted annualized profit improvement                   $ 10,000    
Forecast | Maximum | Project Refuel                        
Restructuring Plan                        
Restructuring charges                 $ 7,000