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Income Taxes and Deferred Income Taxes - Summary of Loss Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Canada $ (323,964) $ (88,930) $ (30,733)
(Loss) income before income taxes (344,986) (109,185) (38,138)
United States      
Other countries (7,814)    
Other Countries      
Other countries $ (13,208) $ (20,255) $ (7,405)