Inventories (Tables)

3 Months Ended

Jul. 31, 2019

Inventory, Net [Abstract]

Components of Inventories

The components of inventories were: 

	July 31,			April 30,
(in thousands)	2019			2019
Raw materials	$	51,331		$	46,054
Work-in-process	42,597			43,794
Finished goods	37,606			34,873
Total FIFO inventories	131,534			124,721
Reserve to adjust inventories to LIFO value	(16,193		)	(16,193		)
Total inventories	$	115,341		$	108,528