Investments, Available-for-sale Securities, Additional Disclosures (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 23, 2012	Dec. 25, 2011	Dec. 23, 2012	Dec. 25, 2011	Jun. 24, 2012
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments		$ 1,815,000		$ 2,379,000
Gross realized gains on available-for-sale securities investments		0		100,000
Total proceeeds from the sale of available-for-sale securities	52,100,000	9,500,000	52,131,000	14,863,000
Amount reclassified from accumulated other comprehensive income to earnings	0	0	0	200,000
Continuous unrealized loss position, market value [Abstract]
Market value, securities held in a loss position for less than 12 months	3,579,000		3,579,000		46,420,000
Market value, total in a loss position	3,579,000		3,579,000		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	(263,000)		(263,000)		(11,000)
Gross unrealized losses, total in a loss position	(263,000)		(263,000)		(11,000)
Amortized cost, by contractual maturity [Abstract]
Amortized cost, Due in 1 year or less	10,067,000		10,067,000
Amortized cost, Due in 1-2 years	4,991,000		4,991,000
Amortized cost, Total investments	15,058,000		15,058,000
Estimated market value, by contractual maturity [Abstract]
Estimated market value, Due in 1 year or less	10,104,000		10,104,000
Estimated market value, Due in 1-2 years	5,003,000		5,003,000
Estimated market value, Total investments	15,107,000		15,107,000
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	3,579,000		3,579,000
Market value, total in a loss position	3,579,000		3,579,000
Continuous unrealized loss position, gross unrealized losses [Abstract]
Gross unrealized losses, securities held in a loss position for less than 12 months	(263,000)		(263,000)
Gross unrealized losses, total in a loss position	(263,000)		(263,000)
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	3,000,000		3,000,000
Dividend income from common stock investments		100,000	100,000	100,000
Other-than-temporary impairments		315,000		850,000
Privately held domestic company - common and preferred stock [Member]
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments		1,500,000		1,500,000
Mortgage-backed and Asset-backed Securities [Member]
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments				$ 29,000