Inventories (Tables)

9 Months Ended

Jan. 31, 2015

Inventory, Net [Abstract]

Components Of Inventories

The components of inventories were: 

	January 31,			April 30,
(in thousands)	2015			2014
Raw materials	$	18,947		$	13,756
Work-in-process	18,047			19,179
Finished goods	12,720			13,439
Total FIFO inventories	49,714			46,374
Reserve to adjust inventories to LIFO value	(14,843		)	(14,851		)
Total LIFO inventories	$	34,871		$	31,523