Inventories (Tables)

6 Months Ended

Oct. 31, 2015

Inventory, Net [Abstract]

Components of Inventories

The components of inventories were: 

	October 31,			April 30,
(in thousands)	2015			2015
Raw materials	$	17,542		$	17,199
Work-in-process	18,582			18,095
Finished goods	16,159			14,797
Total FIFO inventories	52,283			50,091
Reserve to adjust inventories to LIFO value	(14,482		)	(14,103		)
Total LIFO inventories	$	37,801		$	35,988