Inventories (Tables)

3 Months Ended

Jul. 31, 2012

Inventories [Abstract]

Components Of Inventories

	July 31,		April 30,
(in thousands)	2012		2012
Raw materials	$	10,214	$	9,412
Work-in-process		15,126		14,543
Finished goods		9,484		8,734
Total FIFO inventories		34,824		32,689
Reserve to adjust inventories to LIFO value		(10,346)		(10,349)
Total LIFO inventories	$	24,478	$	22,340