Investments, Available-for-sale Securities, Additional Disclosures (Details) (USD $)	3 Months Ended		9 Months Ended
	Mar. 24, 2013	Mar. 25, 2012	Mar. 24, 2013	Mar. 25, 2012	Jun. 24, 2012
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments	$ 350,000		$ 350,000	$ 2,383,000
Total proceeeds from the sale of available-for-sale securities		12,200,000	52,131,000	27,109,000
Amount reclassified from accumulated other comprehensive income to earnings		0	0	(200,000)
Continuous unrealized loss position, market value [Abstract]
Market value, securities held in a loss position for less than 12 months	4,631,000		4,631,000		46,420,000
Market value, total in a loss position	4,631,000		4,631,000		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	(152,000)		(152,000)		(11,000)
Gross unrealized losses, total in a loss position	(152,000)		(152,000)		(11,000)
Amortized cost, by contractual maturity [Abstract]
Amortized cost, Due in 1 year or less	15,053,000		15,053,000
Amortized cost, Total investments	15,053,000		15,053,000
Estimated market value, by contractual maturity [Abstract]
Estimated market value, Due in 1 year or less	15,058,000		15,058,000
Estimated market value, Total investments	15,058,000		15,058,000
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)
Equity Securities [Member]
Continuous unrealized loss position, market value [Abstract]
Market value, securities held in a loss position for less than 12 months	4,631,000		4,631,000
Market value, total in a loss position	4,631,000		4,631,000
Continuous unrealized loss position, gross unrealized losses [Abstract]
Gross unrealized losses, securities held in a loss position for less than 12 months	(152,000)		(152,000)
Gross unrealized losses, total in a loss position	(152,000)		(152,000)
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		1
Fair Value Of Put Option	2,900,000		2,900,000
Dividend income from common stock investments	100,000		200,000	100,000
Other-than-temporary impairments				850,000
Privately held domestic company - common and preferred stock [Member]
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments				1,504,000
Privately held company - note receivable [Member]
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments	350,000		350,000
Mortgage-backed and Asset-backed Securities [Member]
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments				$ 29,000