Investments (Summary of Marketable Investments by Type) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 25, 2011	Jun. 26, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 511,825	$ 688,233
Gross Unrealized Gains	4,512	7,093
Gross Unrealized Losses	(742)	(127)
Estimated Fair Value	515,595	695,199
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	196,688	391,465
Gross Unrealized Gains	2,657	3,943
Gross Unrealized Losses	(4)	(10)
Estimated Fair Value	199,341	395,398
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	168,732	207,241
Gross Unrealized Gains	1,374	2,312
Gross Unrealized Losses	(614)	(115)
Estimated Fair Value	169,492	209,438
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	68,002	10,003
Gross Unrealized Gains	5	12
Gross Unrealized Losses	(3)	0
Estimated Fair Value	68,004	10,015
Municipal Variable Rate Demand Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,795	295
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2,795	295
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,149	4,999
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2,149	4,999
U.S. Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	72,446	67,244
Gross Unrealized Gains	476	807
Gross Unrealized Losses	(119)	(2)
Estimated Fair Value	72,803	68,049
Non-U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,013	6,986
Gross Unrealized Gains	0	19
Gross Unrealized Losses	(2)	0
Estimated Fair Value	$ 1,011	$ 7,005

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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