Inventories (Tables)

3 Months Ended

Jul. 31, 2020

Inventory, Net [Abstract]

Components of Inventories

The components of inventories were: 

	July 31,		April 30,
(in thousands)	2020		2020
Raw materials	$	50,869	$	51,460
Work-in-process	49,129		42,381
Finished goods	41,279		32,572
Total FIFO inventories	141,277		126,413
Reserve to adjust inventories to LIFO value	(14,577)		(14,577)
Total inventories	$	126,700	$	111,836