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Investments, Available-for-sale Securities, Additional Disclosures (Details) (USD $)
3 Months Ended 6 Months Ended
Dec. 25, 2011
Sep. 25, 2011
Dec. 26, 2010
Dec. 25, 2011
Dec. 26, 2010
Continuous unrealized loss position, market value [Abstract]          
Market value, securities held in a loss position for less than 12 months $ 11,635,000     $ 11,635,000  
Market value, total in a loss position 11,635,000     11,635,000  
Continuous unrealized loss position, gross unrealized losses [Abstract]          
Gross unrealized losses, securities held in a loss position for less than 12 months (417,000)     (417,000)  
Gross unrealized losses, total in a loss position (417,000)     (417,000)  
Available-for-sale securities, additional disclosures [Abstract]          
Number of strategic investments with a put option 1     1  
Other-than-temporary impairments 1,800,000   0 2,300,000 500,000
Amortized cost, by contractual maturity [Abstract]          
Amortized cost, Due in 1 year or less 115,249,000     115,249,000  
Amortized cost, Due in 1-2 years 10,046,000     10,046,000  
Amortized cost, Due after 5 years 266,000 [1]     266,000 [1]  
Amortized cost, Total investments 125,561,000     125,561,000  
Estimated market value, by contractual maturity [Abstract]          
Estimated market value, Due in 1 year or less 115,344,000     115,344,000  
Estimated market value, Due in 1-2 years 10,046,000     10,046,000  
Estimated market value, Due after 5 years 266,000 [1]     266,000 [1]  
Estimated market value, Total investments 125,656,000     125,656,000  
Gross realized gains on available-for-sale securities investments 0   3,500,000 100,000 4,000,000
Amount reclassified from accumulated other comprehensive income to earnings 0   1,800,000 200,000 1,900,000
U.S. Government and Agency Obligations [Member]
         
Continuous unrealized loss position, market value [Abstract]          
Market value, securities held in a loss position for less than 12 months 7,985,000     7,985,000  
Market value, total in a loss position 7,985,000     7,985,000  
Continuous unrealized loss position, gross unrealized losses [Abstract]          
Gross unrealized losses, securities held in a loss position for less than 12 months (5,000)     (5,000)  
Gross unrealized losses, total in a loss position (5,000)     (5,000)  
Equity Securities [Member]
         
Continuous unrealized loss position, market value [Abstract]          
Market value, securities held in a loss position for less than 12 months 3,650,000     3,650,000  
Market value, total in a loss position 3,650,000     3,650,000  
Continuous unrealized loss position, gross unrealized losses [Abstract]          
Gross unrealized losses, securities held in a loss position for less than 12 months (412,000)     (412,000)  
Gross unrealized losses, total in a loss position (412,000)     (412,000)  
Available-for-sale securities, additional disclosures [Abstract]          
Number of strategic investments with a put option 1     1  
Fair Value Of Put Option 3,000,000     3,000,000  
Dividend income from common stock investments 100,000      100,000   
Other-than-temporary impairments $ 300,000 $ 500,000     $ 500,000
Number Of Investments For Which Other Than Temporary Impairment Was Recognized       1  
Number of investments in publicly traded foreign companies       3  
[1] Contractual maturity for the asset-backed security was based on the initial contractual maturity date.