Investments, Available-for-sale Securities, Additional Disclosures (Details) (USD $)	3 Months Ended
	Sep. 23, 2012	Sep. 25, 2011	Jun. 24, 2012
Available-for-sale securities, additional disclosures [Abstract]
Other-than-temporary impairments		$ 535,000
Continuous unrealized loss position, market value [Abstract]
Market value, securities held in a loss position for less than 12 months	3,579,000		46,420,000
Market value, total in a loss position	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	(808,000)		(11,000)
Gross unrealized losses, total in a loss position	(808,000)		(11,000)
Amortized cost, by contractual maturity [Abstract]
Amortized cost, Due in 1 year or less	75,738,000
Amortized cost, Due in 1-2 years	10,034,000
Amortized cost, Total investments	85,772,000
Estimated market value, by contractual maturity [Abstract]
Estimated market value, Due in 1 year or less	75,777,000
Estimated market value, Due in 1-2 years	10,048,000
Estimated market value, Total investments	85,825,000
Gross realized gains on available-for-sale securities investments		100,000
Total proceeeds from the sale of available-for-sale securities	0	5,342,000
Gross realized losses on available-for-sale securities investments		0
Amount reclassified from accumulated other comprehensive income to earnings		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			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
Market value, total in a loss position	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	(808,000)
Gross unrealized losses, total in a loss position	(808,000)
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	2,900,000
Dividend income from common stock investments	100,000
Other-than-temporary impairments		$ 535,000