Inventories (Tables)

6 Months Ended

Oct. 31, 2020

Inventory, Net [Abstract]

Components of Inventories

The components of inventories were: 

	October 31,		April 30,
(in thousands)	2020		2020
Raw materials	$	51,500	$	51,460
Work-in-process	50,007		42,381
Finished goods	41,247		32,572
Total FIFO inventories	142,754		126,413
Reserve to adjust inventories to LIFO value	(15,039)		(14,577)
Total inventories	$	127,715	$	111,836