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Investments in Unconsolidated Affiliates - Financial Results of Four Largest Unconsolidated Affiliates (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2020
May 31, 2019
WAVE | Discontinued Operations Held for Sale    
Investments In And Advances To Affiliates [Line Items]    
Net income attributable to discontinued operations $ 49,770 $ 6,830