Goodwill and Acquisition-Related Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 28, 2015	Mar. 29, 2014
Gross and net amounts of goodwill and of acquisition-related intangibles
Goodwill	$ 159,296us-gaap_Goodwill	$ 159,296us-gaap_Goodwill
Total acquisition-related intangibles, gross	124,246	138,576
Less accumulated amortization	(111,494)	(109,709)
Total	12,752us-gaap_FiniteLivedIntangibleAssetsNet	28,867us-gaap_FiniteLivedIntangibleAssetsNet
Core Technology [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	77,640	91,860
Less accumulated amortization	(64,988)	(63,267)
Total	12,652	28,593
Weighted-Average Amortization Life	5 years 7 months 0 days
Other Intangibles [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	46,606	46,716
Less accumulated amortization	(46,506)	(46,442)
Total	$ 100	$ 274
Weighted-Average Amortization Life	2 years 8 months 12 days

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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