Goodwill and Intangible Assets, Net (Details 1) (USD $)	Mar. 30, 2014		Mar. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 355,702,000		$ 384,172,000
Accumulated Amortization	(336,961,000)		(335,570,000)
Net Assets	18,741,000		48,602,000
Total amortizable purchased intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets			381,739,000
Accumulated Amortization			(335,570,000)
Net Assets			46,169,000
Existing technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	217,923,000		241,197,000
Accumulated Amortization	(203,888,000)		(203,129,000)
Net Assets	14,035,000	[1]	38,068,000
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	4,411,000		4,411,000
Accumulated Amortization	(2,934,000)		(2,018,000)
Net Assets	1,477,000		2,393,000
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	131,093,000		131,931,000
Accumulated Amortization	(128,681,000)		(128,107,000)
Net Assets	2,412,000	[1]	3,824,000
Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets			1,600,000
Accumulated Amortization			(1,509,000)
Net Assets			91,000
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	2,275,000		2,600,000
Accumulated Amortization	(1,458,000)		(807,000)
Net Assets	817,000	[1]	1,793,000
IPR&D
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets			2,433,000	[2]
Accumulated Amortization			0	[2]
Net Assets			2,433,000	[2]
High-Speed Converter Business
Acquired Finite-Lived Intangible Assets [Line Items]
Current intangible assets	$ 6,600,000

[1] Includes $6.6 million in HSC assets held for sale.

[2] IPR&D is initially capitalized at fair value as an intangible asset with an indefinite life and assessed for impairment thereafter. When the IPR&D project is complete, it is reclassified as an amortizable purchased intangible asset and is amortized over its estimated useful life. If an IPR&D project is abandoned, the Company will record a charge for the carrying value of the related intangible asset to its Consolidated Statements of Operations in the period it is abandoned.