Cash, Cash Equivalents and Short-Term Marketable Securities (Details 3) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Apr. 01, 2012
Investments in marketable securities
Amortized Cost	$ 190,763	$ 190,102
Unrealized Gross Gains	672	940
Unrealized Gross Losses	(325)	(286)
Unrealized Net Gain (Loss)	347	654
Total Fair Value	191,110	190,756
Money market funds [Member]
Investments in marketable securities
Amortized Cost	6,222	3,088
Total Fair Value	6,222	3,088
U.S. government and agency securities [Member]
Investments in marketable securities
Amortized Cost	47,160	44,687
Unrealized Gross Gains	115	189
Unrealized Gross Losses	(5)	(50)
Unrealized Net Gain (Loss)	110	139
Total Fair Value	47,270	44,826
Corporate bonds and notes [Member]
Investments in marketable securities
Amortized Cost	66,814	68,857
Unrealized Gross Gains	274	410
Unrealized Gross Losses	(79)	(33)
Unrealized Net Gain (Loss)	195	377
Total Fair Value	67,009	69,234
Asset-backed securities [Member]
Investments in marketable securities
Amortized Cost	27,394	26,353
Unrealized Gross Gains	68	55
Unrealized Gross Losses	(29)	(44)
Unrealized Net Gain (Loss)	39	11
Total Fair Value	27,433	26,364
Mortgage-backed securities [Member]
Investments in marketable securities
Amortized Cost	43,173	47,117
Unrealized Gross Gains	215	286
Unrealized Gross Losses	(212)	(159)
Unrealized Net Gain (Loss)	3	127
Total Fair Value	$ 43,176	$ 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 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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- 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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