Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Summary of inventories stated at lower of cost or market
Finished Goods, net	$ 27,424	$ 29,051
Raw Materials, net	19,670	20,434
Work in Progress, net	6,939	4,340
Total Inventories, net	$ 54,033	$ 53,825