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Basis of Preparation - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
May 31, 2021
Feb. 28, 2021
Nov. 30, 2020
Aug. 31, 2020
May 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 31, 2021
May 31, 2020
May 31, 2019
Basis Of Preparation [Abstract]                      
Consolidated net loss $ (33,605,000) $ 258,626,000 $ 89,249,000 $ 21,744,000 $ 84,306,000 $ 11,699,000 $ 6,265,000 $ (1,435,000) $ 336,014,000 $ 100,833,000 $ 36,093,000
Net cash used in operating activities                 (44,717,000) (100,627,000) (42,049,000)
Working capital 482,368,000       461,732,000       482,368,000 461,732,000  
Consolidated VIEs $ 0       $ 0       0 $ 0 $ 0
Noncontrolling Interest gain (loss) recognized                 $ 0