Discontinued Operations and Assets Held for Sale (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Results of discontinued operations [Abstract]
Net sales			$ 25,177,000
Cost of sales			(32,627,000)
Operating expenses			(3,676,000)
Income tax benefit	0	0	909,000
Net loss from discontinued operations	0	0	(10,217,000)
Discontinued Operations [Member]
Results of discontinued operations [Abstract]
Amount of assets disposed of in sale of various parts of the SST acquisition			$ 23,600,000