Cash, Cash Equivalents and Short-Term Marketable Securities (Details 4) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Apr. 01, 2012
Amortized cost and estimated fair value of cash equivalents and marketable securities classified as available-for-sale
Cash equivalents and marketable securities, Amortized Cost, Less than 1 year	$ 62,046	$ 48,978
Cash equivalents and marketable securities, Fair Value, Less than 1 year	62,067	49,011
Cash equivalents and marketable securities, Amortized Cost, Due in 1 to 5 years	128,717	141,124
Cash equivalents and marketable securities, Fair Value, Due in 1 to 5 years	129,043	141,745
Cash equivalents and marketable securities, Amortized Cost	190,763	190,102
Total Fair Value	$ 191,110	$ 190,756

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 investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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