PROPERTY AND EQUIPMENT, NET (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Property and Equipment, Net [Abstract]
Property and equipment, gross	$ 52,130,000	$ 48,124,000
Accumulated depreciation and amortization	(26,800,000)	(23,828,000)
Property and equipment, net	25,330,000	24,296,000
Depreciation and amortization	5,400,000	4,500,000	3,900,000
Machinery and Equipment [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross	28,676,000	26,910,000
Furniture and Fixtures [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross	1,567,000	1,565,000
Computer Equipment [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross	5,840,000	4,805,000
Leasehold Improvements [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross	10,098,000	9,372,000
Construction in Progress [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross	$ 5,949,000	$ 5,472,000