Fair Value Measurements - Investments (Details) (USD $)	Dec. 28, 2013	Mar. 30, 2013
Schedule of Available-for-sale Securities
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	$ 6,000,000
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	55,500,000
Available for sale Securities Current
Schedule of Available-for-sale Securities
Cost	55,459,000	90,530,000
Unrealized Gain	9,000	15,000
Unrealized Loss	0	0
Fair Value	55,468,000	90,545,000
Available for sale Securities Current \| Commercial Paper
Schedule of Available-for-sale Securities
Cost	20,447,000	51,443,000
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	20,447,000	51,443,000
Available for sale Securities Current \| Government agencies
Schedule of Available-for-sale Securities
Cost	6,035,000	26,556,000
Unrealized Gain	1,000	8,000
Unrealized Loss	0	0
Fair Value	6,036,000	26,564,000
Available for sale Securities Current \| Corporate Bonds
Schedule of Available-for-sale Securities
Cost	18,549,000	10,473,000
Unrealized Gain	1,000	7,000
Unrealized Loss	0	0
Fair Value	18,550,000	10,480,000
Available for sale Securities Current \| Municipal Bonds
Schedule of Available-for-sale Securities
Cost	10,428,000	2,058,000
Unrealized Gain	7,000	0
Unrealized Loss	0	0
Fair Value	10,435,000	2,058,000
Available for sale Securities Non Current
Schedule of Available-for-sale Securities
Cost	6,017,000	12,335,000
Unrealized Gain	7,000	1,000
Unrealized Loss	0	(7,000)
Fair Value	6,024,000	12,329,000
Available for sale Securities Non Current \| Government agencies
Schedule of Available-for-sale Securities
Cost	1,998,000	3,082,000
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	1,998,000	3,082,000
Available for sale Securities Non Current \| Corporate Bonds
Schedule of Available-for-sale Securities
Cost		7,923,000
Unrealized Gain		0
Unrealized Loss		(7,000)
Fair Value		7,916,000
Available for sale Securities Non Current \| Municipal Bonds
Schedule of Available-for-sale Securities
Cost	4,019,000	1,330,000
Unrealized Gain	7,000	1,000
Unrealized Loss	0	0
Fair Value	$ 4,026,000	$ 1,331,000

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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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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- Definition

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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