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Segment Data - Financial Information for Reportable Segments (Parenthetical) (Detail) - USD ($)
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Segment Reporting Information [Line Items]      
Restructuring (charges) gains $ 4,785,000 $ (295,000) $ 1,913,000
Gains on investment in Nikola   655,102,000  
Impairment charge $ 3,076,000 13,739,000 82,690,000
Nikola Corporation      
Segment Reporting Information [Line Items]      
Gains on investment in Nikola   $ 655,102,000  
WAVE      
Segment Reporting Information [Line Items]      
Pre-tax gain realized from the transaction     23,119,000
Nisshin      
Segment Reporting Information [Line Items]      
Impairment charge     4,236,000
Samuel Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Gain in pre-tax earnings     $ 6,055,000