Restructuring Plan (Details) - USD ($) $ in Thousands	3 Months Ended	8 Months Ended	20 Months Ended
	May 31, 2018	May 31, 2018	May 31, 2019
Restructuring Plan
Restructuring charges	$ 1,725
Project Refuel
Restructuring Plan
Restructuring charges	1,700	$ 3,500
Cash restructuring payments	1,100
Restructuring liability	1,300	$ 1,300
Minimum | Project Refuel
Restructuring Plan
Targeted annualized profit improvement	8,000
Maximum | Project Refuel
Restructuring Plan
Targeted annualized profit improvement	$ 10,000
Forecast | Minimum | Project Refuel
Restructuring Plan
Restructuring charges			$ 4,000
Forecast | Maximum | Project Refuel
Restructuring Plan
Restructuring charges			$ 5,500