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Basis of Presentation (Tables)
3 Months Ended
Aug. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Inventory Inventory is comprised of the following: 
(In thousands)August 31,
2020
May 31,
2020
Raw materials$18,560 $18,661 
Work in process26,747 29,497 
Finished goods442,858 360,740 
 $488,165 $408,898