Inventories (Tables)

9 Months Ended

Dec. 31, 2012

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

	December 31,		March 31,
	2012		2012
At cost - FIFO basis:
Raw materials	$	58,095	$	59,252
Work-in-process		11,579		18,952
Finished goods		52,793		49,315
		122,467		127,519
LIFO cost less than FIFO cost		(20,936)		(19,464)
Net inventories	$	101,531	$	108,055