Basis of Presentation - Schedule of Inventory (Details) - USD ($) $ in Thousands	Nov. 30, 2017	May 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 16,231	$ 17,528
Work in process	23,199	17,951
Finished goods	233,400	242,739
Inventories, net	$ 272,830	$ 278,218