COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Future minimum rental commitments under non-cancelable operating leases
2014	$ 3,838,000
2015	4,068,000
2016	3,970,000
2017	3,473,000
2018	3,650,000
Thereafter	8,350,000
Total future minimum lease payments before estimated sublease income	27,349,000
Less: estimated sublease income	(1,956,000)
Total future minimum lease payments	25,393,000
Rent expense related to operating leases
Rent expense	5,000,000	4,200,000	5,400,000
Sublease income	2,600,000	9,200,000	7,300,000
Purchase commitments
Open purchase order commitments	$ 76,000,000
Minimum
Lease Commitments
Term of operating leases	1 year
Maximum
Lease Commitments
Term of operating leases	20 years
Provisions for extension of lease term	10 years