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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, 2023
May 31, 2022
May 31, 2021
Discontinued Operations              
Losses on sale and exit of business         $ 0.7 $ 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