Investments (Details) (USD $)	12 Months Ended															12 Months Ended		12 Months Ended							3 Months Ended
	Jun. 26, 2011	Jun. 27, 2010	Jun. 28, 2009	Jun. 26, 2011 Short-Term Investment [Member]	Jun. 27, 2010 Short-Term Investment [Member]	Jun. 26, 2011 Short-Term Investment [Member] Corporate Debt [Member]	Jun. 26, 2011 Short-Term Investment [Member] U.S. Government and Agency Obligations [Member]	Jun. 27, 2010 Short-Term Investment [Member] U.S. Government and Agency Obligations [Member]	Jun. 26, 2011 Long-Term Investment [Member]	Jun. 27, 2010 Long-Term Investment [Member]	Jun. 26, 2011 Long-Term Investment [Member] U.S. Government and Agency Obligations [Member]	Jun. 27, 2010 Long-Term Investment [Member] U.S. Government and Agency Obligations [Member]	Jun. 27, 2010 Long-Term Investment [Member] Mortgage-backed Securities [Member]	Jun. 26, 2011 Long-Term Investment [Member] Asset-backed Securities [Member]	Jun. 27, 2010 Long-Term Investment [Member] Asset-backed Securities [Member]	Jun. 28, 2009 Corporate Debt [Member]	Jun. 27, 2010 U.S. Government and Agency Obligations [Member]	Jun. 27, 2010 Mortgage-backed and Asset-backed Securities [Member]	Jun. 28, 2009 Mortgage-backed and Asset-backed Securities [Member]	Jun. 26, 2011 Equity Securities [Member]	Jun. 27, 2010 Equity Securities [Member]	Jun. 28, 2009 Equity Securities [Member]	Jun. 26, 2011 Equity Securities Intent and Ability to Hold Investment Indefinitely [Member]	Jun. 27, 2010 Equity Securities Intent and Ability to Hold Investment Indefinitely [Member]	Sep. 26, 2010 Equity Securities Issuer Initiated Reorganization [Member]	Jun. 27, 2010 Equity Securities Issuer Initiated Reorganization [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Costs				$ 185,316,000	$ 308,469,000	$ 55,964,000	$ 129,352,000	$ 308,469,000	$ 13,095,000	$ 38,162,000	$ 12,501,000	$ 20,043,000	$ 9,089,000	$ 594,000	$ 9,030,000					$ 12,963,000	$ 14,397,000
Gross Unrealized Gain				225,000	919,000	51,000	174,000	919,000	230,000	5,596,000	43,000	378,000	2,689,000	187,000	2,529,000					9,473,000	3,791,000
Gross Unrealized Loss				0	(4,000)	0	0	(4,000)	0	(7,000)	0	(3,000)	0	0	(4,000)					0	0
Net Unrealized Gain				225,000	915,000	51,000	174,000	915,000	230,000	5,589,000	43,000	375,000	2,689,000	187,000	2,525,000					9,473,000	3,791,000
Market Value				185,541,000	309,384,000	56,015,000	129,526,000	309,384,000	13,325,000	43,751,000	12,544,000	20,418,000	11,778,000	781,000	11,555,000					22,436,000	18,188,000
Available-for-sale securities, additional disclosures [Abstract]
Number of investments in publicly traded foreign companies																				3
Fair value of put option held on one investment																				2,800,000
Dividend income from common stock investments																				100,000	100,000	300,000
Other-than-temporary impairments	1,400,000	3,400,000	39,200,000															900,000	33,300,000	1,400,000	2,500,000	5,900,000	900,000	1,200,000	500,000	1,300,000
Number of investments for which other-than-temporary impairment was recognized																				2	2
Stated maturity, minimum (in years)																1
Stated maturity, maximum (in years)																27
Expected maturity, minimum (in months)																3
Expected maturity, maximum (in years)																20
Continuous unrealized loss position, market value [Abstract]
Market value, securities held in a loss position for less than 12 months		27,245,000															27,245,000
Market value, securities held in a loss position for 12 months or more		0															0
Market value, total in a loss position		27,245,000															27,245,000
Continuous unrealized loss position, gross unrealized losses [Abstract]
Gross unrealized losses, securities held in a loss position for less than 12 months		(7,000)															(7,000)
Gross unrealized losses, securities held in a loss position for 12 months or more		0															0
Gross unrealized losses, total in a loss position		(7,000)															(7,000)
Amortized cost, by contractual maturity [Abstract]
Amortized cost, Due in 1 year or less	185,316,000
Amortized cost, Due in 1-2 years	12,501,000
Amortized cost, Due in 2-5 years	0
Amortized cost, Due after 5 years	594,000
Amortized cost, Total investments	198,411,000
Estimated market value, by contractual maturity [Abstract]
Estimated market value, Due in 1 year or less	185,541,000
Estimated market value, Due in 1-2 years	12,544,000
Estimated market value, Due in 2-5 years	0
Estimated market value, Due after 5 years	781,000
Estimated market value, Total investments	198,866,000
Gross realized gains on available-for-sale securities investments	8,200,000	6,500,000	5,800,000
Gross realized losses on available-for-sale securities investments	300,000	0	9,200,000
Amount reclassified from accumulated other comprehensive income to earnings	$ 5,600,000	$ 1,800,000	$ 37,100,000