Inventories (Tables)

9 Months Ended

Jan. 31, 2021

Inventory, Net [Abstract]

Components of Inventories

The components of inventories were: 

	January 31,		April 30,
(in thousands)	2021		2020
Raw materials	$	60,321	$	51,460
Work-in-process	51,967		42,381
Finished goods	47,343		32,572
Total FIFO inventories	159,631		126,413
Reserve to adjust inventories to LIFO value	(15,039)		(14,577)
Total inventories	$	144,592	$	111,836