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Sale of Composites Business (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 31, 2020
Nov. 30, 2021
May 31, 2021
Aug. 31, 2020
May 31, 2022
May 31, 2021
Discontinued Operations            
Losses on sale and exit of business         $ 1.7 $ 20.2
Composites Business            
Discontinued Operations            
Losses on sale and exit of business     $ 0.7 $ 19.5    
Maximum contingent consideration $ 6.5     $ 6.5    
Contingent consideration period for achievement of target sales 3 years          
Charge recognized to reflect reduction of fair value   $ 1.3        
Fair value of earn-out consideration   $ 0.0