Inventories (Tables)

3 Months Ended

Jul. 31, 2013

Inventories [Abstract]

Components Of Inventories

	July 31,		April 30,
(in thousands)	2013		2013
Raw materials	$	12,321	$	11,823
Work-in-process		17,362		17,170
Finished goods		12,066		11,318
Total FIFO inventories		41,749		40,311
Reserve to adjust inventories to LIFO value		(10,982)		(10,973)
Total LIFO inventories	$	30,767	$	29,338