Inventories (Tables)

3 Months Ended

Jul. 31, 2014

Inventory, Net [Abstract]

Components Of Inventories

The components of inventories were: 

	July 31,			April 30,
(in thousands)	2014			2014
Raw materials	$	16,039		$	13,756
Work-in-process	19,746			19,179
Finished goods	14,532			13,439
Total FIFO inventories	50,317			46,374
Reserve to adjust inventories to LIFO value	(14,860		)	(14,851		)
Total LIFO inventories	$	35,457		$	31,523