Fair Value of Financial Instruments (Details) (USD $)	3 Months Ended	6 Months Ended
Dec. 25, 2011	Dec. 25, 2011	Jun. 26, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value transfers level 1 to level 2	$ 0
Fair value transfers, level 2 to level 1	0
Assets, Fair Value Disclosure [Abstract]
Short-term investments	515,595,000	515,595,000	695,199,000
Realized gains and losses from sale of investments		1,000,000
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	5,711,000	5,711,000	7,386,000
Short-term investments	515,595,000	515,595,000	695,199,000
Total assets	521,306,000	521,306,000	702,585,000
Quoted Prices in Active Markets for Identical Items (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	5,711,000	5,711,000	7,386,000
Short-term investments	0	0	0
Total assets	5,711,000	5,711,000	7,386,000
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0	0
Short-term investments	515,595,000	515,595,000	695,199,000
Total assets	515,595,000	515,595,000	695,199,000
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0	0
Short-term investments	0	0	0
Total assets	0	0	0
Municipal Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	199,341,000	199,341,000	395,398,000
Municipal Bonds [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	199,341,000	199,341,000	395,398,000
Municipal Bonds [Member] \| Quoted Prices in Active Markets for Identical Items (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Municipal Bonds [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	199,341,000	199,341,000	395,398,000
Municipal Bonds [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	169,492,000	169,492,000	209,438,000
Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	169,492,000	169,492,000	209,438,000
Corporate Bonds [Member] \| Quoted Prices in Active Markets for Identical Items (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Corporate Bonds [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	169,492,000	169,492,000	209,438,000
Corporate Bonds [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Municipal Variable Rate Demand Notes [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,795,000	2,795,000	295,000
Municipal Variable Rate Demand Notes [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,795,000	2,795,000	295,000
Municipal Variable Rate Demand Notes [Member] \| Quoted Prices in Active Markets for Identical Items (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Municipal Variable Rate Demand Notes [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,795,000	2,795,000	295,000
Municipal Variable Rate Demand Notes [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Certificates of Deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	68,004,000	68,004,000	10,015,000
Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	68,004,000	68,004,000	10,015,000
Certificates of Deposit [Member] \| Quoted Prices in Active Markets for Identical Items (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Certificates of Deposit [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	68,004,000	68,004,000	10,015,000
Certificates of Deposit [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Commercial Paper [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,149,000	2,149,000	4,999,000
Commercial Paper [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,149,000	2,149,000	4,999,000
Commercial Paper [Member] \| Quoted Prices in Active Markets for Identical Items (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Commercial Paper [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	2,149,000	2,149,000	4,999,000
Commercial Paper [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
U.S. Agency Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	72,803,000	72,803,000	68,049,000
U.S. Agency Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	72,803,000	72,803,000	68,049,000
U.S. Agency Securities [Member] \| Quoted Prices in Active Markets for Identical Items (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
U.S. Agency Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	72,803,000	72,803,000	68,049,000
U.S. Agency Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Non-U.S. Government Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	1,011,000	1,011,000	7,005,000
Non-U.S. Government Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	1,011,000	1,011,000	7,005,000
Non-U.S. Government Securities [Member] \| Quoted Prices in Active Markets for Identical Items (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Non-U.S. Government Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	1,011,000	1,011,000	7,005,000
Non-U.S. Government Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Short-term investments	0	0	0
Money Market Funds [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	5,711,000	5,711,000	7,386,000
Money Market Funds [Member] \| Quoted Prices in Active Markets for Identical Items (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	5,711,000	5,711,000	7,386,000
Money Market Funds [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0	0
Money Market Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	$ 0	$ 0	$ 0

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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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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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