Inventories (Tables)

9 Months Ended

Jan. 31, 2019

Inventory, Net [Abstract]

Components of Inventories

The components of inventories were: 

	January 31,			April 30,
(in thousands)	2019			2018
Raw materials	$	50,216		$	41,728
Work-in-process	46,176			44,905
Finished goods	35,069			34,111
Total FIFO inventories	131,461			120,744
Reserve to adjust inventories to LIFO value	(15,345		)	(15,943		)
Total inventories	$	116,116		$	104,801