Investments, Available-for-sale Securities, Additional Disclosures (Details) (USD $)	3 Months Ended
	Sep. 25, 2011	Sep. 26, 2010
Available-for-sale securities, additional disclosures [Abstract]
Number of strategic investments with a put option	1
Fair value of put option	$ 2,800,000
Other-than-temporary impairments	500,000	500,000
Number of investments for which other-than-temporary impairment was recognized	1
Continuous unrealized loss position, market value [Abstract]
Market value, securities held in a loss position for less than 12 months	7,394,000
Market value, total in a loss position	7,394,000
Continuous unrealized loss position, gross unrealized losses [Abstract]
Gross unrealized losses, securities held in a loss position for less than 12 months	(7,000)
Gross unrealized losses, total in a loss position	(7,000)
Amortized cost, by contractual maturity [Abstract]
Amortized cost, Due in 1 year or less	172,088,000
Amortized cost, Due in 1-2 years	4,497,000
Amortized cost, Due after 5 years	306,000
Amortized cost, Total investments	176,891,000
Estimated market value, by contractual maturity [Abstract]
Estimated market value, Due in 1 year or less	172,248,000
Estimated market value, Due in 1-2 years	4,513,000
Estimated market value, Due after 5 years	302,000
Estimated market value, Total investments	177,063,000
Gross realized gains on available-for-sale securities investments	100,000	500,000
Gross realized losses on available-for-sale securities investments	0	0
Amount reclassified from accumulated other comprehensive income to earnings	100,000	100,000
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	7,092,000
Market value, total in a loss position	7,092,000
Continuous unrealized loss position, gross unrealized losses [Abstract]
Gross unrealized losses, securities held in a loss position for less than 12 months	(3,000)
Gross unrealized losses, total in a loss position	(3,000)
Asset-backed Securities [Member]
Continuous unrealized loss position, market value [Abstract]
Market value, securities held in a loss position for less than 12 months	302,000
Market value, total in a loss position	302,000
Continuous unrealized loss position, gross unrealized losses [Abstract]
Gross unrealized losses, securities held in a loss position for less than 12 months	(4,000)
Gross unrealized losses, total in a loss position	$ (4,000)
Equity Securities [Member]
Available-for-sale securities, additional disclosures [Abstract]
Number of investments in publicly traded foreign companies	3