Inventories (Tables)

12 Months Ended

Apr. 30, 2013

Inventories [Abstract]

Components Of Inventories

		APRIL 30
(in thousands)		2013		2012
Raw materials	$	11,823	$	9,412
Work-in-process		17,170		14,543
Finished goods		11,318		8,734
Total FIFO inventories		40,311		32,689
Reserve to adjust inventories to LIFO value		(10,973)		(10,349)
Total LIFO inventories	$	29,338	$	22,340