Investments (Summary of Marketable Investments by Type) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 23, 2012	Jun. 24, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 647,417	$ 561,470
Gross Unrealized Gains	5,049	4,349
Gross Unrealized Losses	(34)	(191)
Estimated Fair Value	652,432	565,628
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	237,007	209,626
Gross Unrealized Gains	1,936	2,036
Gross Unrealized Losses	(24)	(58)
Estimated Fair Value	238,919	211,604
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	142,437	144,942
Gross Unrealized Gains	2,573	1,848
Gross Unrealized Losses	(7)	(123)
Estimated Fair Value	145,003	146,667
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	185,000	130,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	185,000	130,000
U.S. Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	72,759	68,156
Gross Unrealized Gains	515	450
Gross Unrealized Losses	(2)	(7)
Estimated Fair Value	73,272	68,599
Non-U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,214	8,746
Gross Unrealized Gains	25	15
Gross Unrealized Losses	(1)	(3)
Estimated Fair Value	$ 10,238	$ 8,758

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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