Note 6. Cash, Cash Equivalents and Short Term Marketable Securities (Detail) - Summary of Investments in Marketable Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Apr. 01, 2012
Amortized Cost	$ 195,300	$ 190,102
Unrealized Gross Gains	507	940
Unrealized Gross Losses	(178)	(286)
Fair Value	195,629	190,756
Money Market Funds [Member]
Amortized Cost	5,042	3,088
Fair Value	5,042	3,088
US Government Corporations and Agencies Securities [Member]
Amortized Cost	41,694	44,077
Unrealized Gross Gains	27	189
Unrealized Gross Losses		(30)
Fair Value	41,721	44,236
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	2,927	610
Unrealized Gross Gains	10
Unrealized Gross Losses	(2)	(20)
Fair Value	2,935	590
Corporate Debt Securities [Member]
Amortized Cost	92,059	68,857
Unrealized Gross Gains	215	410
Unrealized Gross Losses	(45)	(33)
Fair Value	92,229	69,234
Asset-backed Securities [Member]
Amortized Cost	30,932	26,353
Unrealized Gross Gains	61	55
Unrealized Gross Losses	(27)	(44)
Fair Value	30,966	26,364
Collateralized Mortgage Backed Securities [Member]
Amortized Cost	22,646	47,117
Unrealized Gross Gains	194	286
Unrealized Gross Losses	(104)	(159)
Fair Value	$ 22,736	$ 47,244

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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