SUMMARY OF ACCOUNTING POLICIES (Details 4) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Components of acquired intangible assets
Intangible assets residual value	$ 0
Gross Carrying Amount	315,350,000	266,421,000
Accumulated Amortization	(233,803,000)	(208,167,000)
Net Carrying Amount	81,547,000	58,254,000
Net carrying amount of patents sold	8,600,000
Total intangible asset amortization expense	29,529,000	49,572,000	66,188,000
Estimated future annual amortization expense for acquired intangible assets
2014	26,383,000
2015	21,436,000
2016	16,778,000
2017	10,069,000
2018	5,179,000
Thereafter	1,702,000
Net Carrying Amount	81,547,000	58,254,000
Customer-related intangibles
Components of acquired intangible assets
Increase in intangible assets	50,700,000
Gross Carrying Amount	294,310,000	243,681,000
Accumulated Amortization	(224,517,000)	(199,238,000)
Net Carrying Amount	69,793,000	44,443,000
Net carrying value of intangible assets of discontinued operations	10,000,000
Estimated future annual amortization expense for acquired intangible assets
Net Carrying Amount	69,793,000	44,443,000
Customer-related intangibles | Saturn
Components of acquired intangible assets
Useful life	5 years
Customer-related intangibles | Maximum
Components of acquired intangible assets
Useful life	8 years
Customer-related intangibles | Weighted-average
Components of acquired intangible assets
Useful life	2 years 3 months 18 days
Licenses and other intangibles
Components of acquired intangible assets
Gross Carrying Amount	21,040,000	22,740,000
Accumulated Amortization	(9,286,000)	(8,929,000)
Net Carrying Amount	11,754,000	13,811,000
Estimated future annual amortization expense for acquired intangible assets
Net Carrying Amount	11,754,000	13,811,000
Licenses and other intangibles | Maximum
Components of acquired intangible assets
Useful life	7 years
Licenses and other intangibles | Weighted-average
Components of acquired intangible assets
Useful life	3 years 3 months 18 days
Other intangibles | Saturn
Components of acquired intangible assets
Developed technology related to the acquisition	$ 10,300,000