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Long-term Investments - Schedule of Long-term Investments (Details) - USD ($)
$ in Thousands
May 31, 2021
May 31, 2020
Investments Debt And Equity Securities [Abstract]    
Equity investments measured at fair value $ 12,185 $ 19,595
Equity investments under measurement alternative 5,500  
Total other investments $ 17,685 $ 19,595