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Non-operating (expense) income - Schedule of Non-Operating (Expense) Income (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Nonoperating Income Expense [Abstract]      
Foreign exchange (loss) gain $ (22,347) $ 6,145 $ 692
Loss on marketable securities   (252) (135)
Gain (loss) on sale of capital assets 1,523 (8,075) 42
(Loss) gain from equity investees (458)   44,191
Deferred gain on sale of intellectual property     257
Loss on promissory notes receivable   (9,698)  
(Loss) gain on long-term investments (2,352) (24,295) 14,860
Unrealized (loss) gain on convertible debentures (170,453) 44,322 36,630
Realized gain on settlement of convertible debentures   9,289  
Legal settlement   (3,241)  
Unrealized loss on financial liabilities     (1,003)
Change in fair value of warrant liability 1,234    
Other non-operating items, net 8,015    
Non operating (expense) income $ (184,838) $ 14,195 $ 95,534