Inventories (Tables)

9 Months Ended

Feb. 28, 2019

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:

	Feb 28, 2019		May 31, 2018
(in thousands)
Raw materials	$	19,852	$	18,678
Work in process	11,210		10,808
Finished goods	21,326		19,430
Inventories	$	52,388	$	48,916