Inventories (Tables)

9 Months Ended

Jan. 31, 2014

Inventories [Abstract]

Components Of Inventories

	January 31,		April 30,
(in thousands)	2014		2013
Raw materials	$	12,797	$	11,823
Work-in-process		16,770		17,170
Finished goods		11,087		11,318
Total FIFO inventories		40,654		40,311
Reserve to adjust inventories to LIFO value		(10,983)		(10,973)
Total LIFO inventories	$	29,671	$	29,338