Inventories (Tables)

6 Months Ended

Nov. 30, 2020

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories are stated at lower of cost and net realizable value (using the first-in, first-out method). Inventories consisted of the following:

(in thousands)	Nov 30, 2020		May 31, 2020
Raw materials	$	21,301	$	23,308
Work in process	7,957		8,318
Finished goods	20,324		28,279
Inventories	$	49,582	$	59,905