Inventories (Tables)

3 Months Ended

Jul. 31, 2016

Inventory, Net [Abstract]

Components of Inventories

The components of inventories were: 

	July 31,			April 30,
(in thousands)	2016			2016
Raw materials	$	18,138		$	17,634
Work-in-process	18,834			18,414
Finished goods	17,186			17,475
Total FIFO inventories	54,158			53,523
Reserve to adjust inventories to LIFO value	(14,204		)	(14,204		)
Total LIFO inventories	$	39,954		$	39,319