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Basis of Presentation (Tables)
 6 Months Ended
Nov. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Inventory
Inventory is comprised of the following amounts at: 
(In thousands)
November 30,
2016
 
May 31,
2016
 
 
 
 
Raw materials
$
11,303

 
$
17,794

Work in process
16,772

 
14,731

Finished goods
235,226

 
216,837

 
$
263,301

 
$
249,362