Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Jan. 01, 2012		Jan. 02, 2011	Jan. 01, 2012		Jan. 02, 2011	Apr. 03, 2011
Goodwill [Roll Forward]
Balance				$ 104,020
Additions				640
Disposal related to divestiture				(8,568)
Balance	96,092			96,092
Acquired Finite-Lived Intangible Assets [Line Items]
Gross assets	356,308			356,308			353,211
Accumulated amortization	(311,400)			(311,400)			(302,190)
Net assets	44,908			44,908			51,021
Amortization expense for purchased intangible assets.	4,006		4,989	12,129		14,916
Cash consideration paid to Samplify				5,000		0
Estimated amortization expense [Abstract]
Remainder of FY 2012				4,293
2013				12,949
2014				10,571
2015				6,926
2016				4,249
Thereafter				3,209
Total				42,197
Developed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross assets	223,455			223,455			219,700
Accumulated amortization	(188,719)			(188,719)			(181,722)
Net assets	34,736			34,736			37,978
Amortization expense for purchased intangible assets.	3,038		3,548	9,142		10,555
Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross assets	2,911			2,911			3,421
Accumulated amortization	(1,039)			(1,039)			(904)
Net assets	1,872			1,872			2,517
Amortization expense for purchased intangible assets.	104		122	349		366
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross assets	127,231			127,231			127,379
Accumulated amortization	(121,642)			(121,642)			(119,564)
Net assets	5,589			5,589			7,815
Amortization expense for purchased intangible assets.	864		1,319	2,641		3,951
In Process Research and Development [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross assets	2,711	[1]		2,711	[1]		2,711	[1]
Accumulated amortization	0	[1]		0	[1]		0	[1]
Net assets	2,711	[1]		2,711	[1]		2,711	[1]
Subtotal [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross assets	353,597			353,597			350,500
Accumulated amortization	(311,400)			(311,400)			(302,190)
Net assets	42,197			42,197			48,310
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense for purchased intangible assets.	0		0	0		44
Existing Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Cash consideration paid to Samplify	5,000
Total fair value of consideration paid for purchased existing technology	6,500			6,500
Estimated useful life of purchased existing technology (in years)	3
Communications [Member]
Goodwill [Roll Forward]
Balance				74,673
Additions				640
Disposal related to divestiture				0
Balance	75,313			75,313
Computing and Consumer [Member]
Goodwill [Roll Forward]
Balance				29,347
Additions				0
Disposal related to divestiture				(8,568)
Balance	$ 20,779			$ 20,779

[1] 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 value of the related intangible asset to its Consolidated Statements of Operations in the period it is abandoned.