Inventories (Tables)

6 Months Ended

Sep. 30, 2012

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

	September 30,		March 31,
	2012		2012
At cost - FIFO basis:
Raw materials	$	61,186	$	59,252
Work-in-process		18,216		18,952
Finished goods		54,115		49,315
		133,517		127,519
LIFO cost less than FIFO cost		(21,466)		(19,464)
Net inventories	$	112,051	$	108,055