Inventories (Tables)

9 Months Ended

Jan. 31, 2017

Inventory, Net [Abstract]

Components of Inventories

The components of inventories were: 

	January 31,			April 30,
(in thousands)	2017			2016
Raw materials	$	19,577		$	17,634
Work-in-process	18,770			18,414
Finished goods	17,496			17,475
Total FIFO inventories	55,843			53,523
Reserve to adjust inventories to LIFO value	(14,575		)	(14,204		)
Total LIFO inventories	$	41,268		$	39,319