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Basis of Presentation (Details) - USD ($)
$ in Thousands
Aug. 31, 2020
May 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 18,560 $ 18,661
Work in process 26,747 29,497
Finished goods 442,858 360,740
Inventories, net 488,165 408,898
Reserves for obsolete inventory $ 48,200 $ 45,500