Investments, Available-for-sale Securities, Additional Disclosures (Details) (USD $)	12 Months Ended
	Jun. 24, 2012	Jun. 26, 2011	Jun. 27, 2010
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments	$ 2,865,000	$ 1,433,000	$ 3,349,000
Continuous unrealized loss position, market value [Abstract]
Market value, securities held in a loss position for less than 12 months	46,420,000
Market value, total in a loss position	46,420,000
Continuous unrealized loss position, gross unrealized losses [Abstract]
Gross unrealized losses, securities held in a loss position for less than 12 months	(11,000)
Gross unrealized losses, total in a loss position	(11,000)
Amortized cost, by contractual maturity [Abstract]
Amortized cost, Due in 1 year or less	63,841,000
Amortized cost, Due in 2-5 years	15,053,000
Amortized cost, Due after 5 years	0
Amortized cost, Total investments	78,894,000
Estimated market value, by contractual maturity [Abstract]
Estimated market value, Due in 1 year or less	63,872,000
Estimated market value, Due in 2-5 years	15,054,000
Estimated market value, Due after 5 years	0
Estimated market value, Total investments	78,926,000
Gross realized gains on available-for-sale securities investments	100,000	8,200,000	6,500,000
Total proceeeds from the sale of available-for-sale securities	75,792,000	128,210,000	146,667,000
Gross realized losses on available-for-sale securities investments	100,000	300,000	0
Amount reclassified from accumulated other comprehensive income to earnings	200,000	5,600,000	1,800,000
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	46,420,000
Market value, total in a loss position	46,420,000
Continuous unrealized loss position, gross unrealized losses [Abstract]
Gross unrealized losses, securities held in a loss position for less than 12 months	(11,000)
Gross unrealized losses, total in a loss position	(11,000)
Asset-backed Securities [Member]
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments	0	0	648,000
Publicly traded foreign company(s) - common stock [Member]
Available-for-sale securities, additional disclosures [Abstract]
Number of investments in publicly traded foreign companies	3
Number of strategic investments with a put option	1
Fair Value Of Put Option	2,800,000
Dividend income from common stock investments	100,000	100,000	100,000
Other-than-temporary impairments	1,332,000	1,433,000	2,493,000
Privately held domestic company - common and preferred stock [Member]
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments	1,504,000	0	0
Mortgage-backed and Asset-backed Securities [Member]
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments	$ 29,000	$ 0	$ 208,000