Marketable Securities (Narrative) (Details) (USD $)	Mar. 28, 2015 security	Mar. 29, 2014 security
Marketable Securities [Abstract]
Gross Unrealized Losses	$ (83,000)	$ (253,000)
Amortized cost on available for sale securities held at gross unrealized loss	$ 154,300,000	$ 207,800,000
Number of securities	34	74

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

Name:	us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant