Fair Value Measurements - Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Mar. 30, 2013
Available for sale Securities Current
Schedule of Available-for-sale Securities
Cost	$ 56,221	$ 90,530
Unrealized Gain	20	15
Unrealized Loss	0	0
Fair Value	56,241	90,545
Available for sale Securities Current \| Commercial Paper
Schedule of Available-for-sale Securities
Cost	14,397	51,443
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	14,397	51,443
Available for sale Securities Current \| Government agencies
Schedule of Available-for-sale Securities
Cost	15,588	26,556
Unrealized Gain	5	8
Unrealized Loss	0	0
Fair Value	15,593	26,564
Available for sale Securities Current \| Corporate Bonds
Schedule of Available-for-sale Securities
Cost	13,394	10,473
Unrealized Gain	9	7
Unrealized Loss	0	0
Fair Value	13,403	10,480
Available for sale Securities Current \| Municipal Bonds
Schedule of Available-for-sale Securities
Cost	12,842	2,058
Unrealized Gain	6	0
Unrealized Loss	0	0
Fair Value	12,848	2,058
Available for sale Securities Non Current
Schedule of Available-for-sale Securities
Cost	10,386	12,335
Unrealized Gain	8	1
Unrealized Loss	(6)	(7)
Fair Value	10,388	12,329
Available for sale Securities Non Current \| Government agencies
Schedule of Available-for-sale Securities
Cost	1,996	3,082
Unrealized Gain	3	0
Unrealized Loss	0	0
Fair Value	1,999	3,082
Available for sale Securities Non Current \| Corporate Bonds
Schedule of Available-for-sale Securities
Cost	4,326	7,923
Unrealized Gain	0	0
Unrealized Loss	(6)	(7)
Fair Value	4,320	7,916
Available for sale Securities Non Current \| Municipal Bonds
Schedule of Available-for-sale Securities
Cost	4,064	1,330
Unrealized Gain	5	1
Unrealized Loss	0	0
Fair Value	$ 4,069	$ 1,331

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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