Inventories (Tables)

9 Months Ended

Jan. 31, 2020

Inventory, Net [Abstract]

Components of Inventories

The components of inventories were: 

	January 31,			April 30,
(in thousands)	2020			2019
Raw materials	$	55,875		$	46,054
Work-in-process	45,230			43,794
Finished goods	37,018			34,873
Total FIFO inventories	138,123			124,721
Reserve to adjust inventories to LIFO value	(16,193		)	(16,193		)
Total inventories	$	121,930		$	108,528