Financial Instruments (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 25, 2011	Jun. 26, 2011
Financial Instruments [Line Items]
Fair value	$ 712,856	$ 630,115
Derivatives Assets	1,002	1,994
Total	2,270,369	2,125,504
Derivative Liabilities	5,785	1,924
Level 1 [Member]
Financial Instruments [Line Items]
Fair value	6,064	8,496
Total	1,561,818	1,500,389
Level 2 [Member]
Financial Instruments [Line Items]
Fair value	706,792	621,619
Derivatives Assets	1,002	1,994
Total	708,551	625,115
Derivative Liabilities	5,785	1,924
Fixed Income Money Market Funds [Member]
Financial Instruments [Line Items]
Fair value	1,364,760	1,300,098
Fixed Income Money Market Funds [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Fair value	1,364,760	1,300,098
Municipal Notes And Bonds [Member]
Financial Instruments [Line Items]
Fair value	400,290	321,339
Municipal Notes And Bonds [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Fair value	400,290	321,339
US Treasury And Agencies [Member]
Financial Instruments [Line Items]
Fair value	6,064	8,496
US Treasury And Agencies [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Fair value	6,064	8,496
Government-Sponsored Enterprises [Member]
Financial Instruments [Line Items]
Fair value	37,851	19,868
Government-Sponsored Enterprises [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Fair value	37,851	19,868
Foreign Government Bonds [Member]
Financial Instruments [Line Items]
Fair value	1,002	1,005
Foreign Government Bonds [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Fair value	1,002	1,005
Corporate Notes And Bonds [Member]
Financial Instruments [Line Items]
Fair value	378,264	382,432
Corporate Notes And Bonds [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Fair value	164,885	164,885
Corporate Notes And Bonds [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Fair value	213,379	217,547
Mortgage Backed Securities-Residential [Member]
Financial Instruments [Line Items]
Fair value	1,343	2,633
Mortgage Backed Securities-Residential [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Fair value	1,343	2,633
Mortgage Backed Securities- Commercial [Member]
Financial Instruments [Line Items]
Fair value	53,684	60,729
Mortgage Backed Securities- Commercial [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Fair value	53,684	60,729
Total Short-Term Investments [Member]
Financial Instruments [Line Items]
Fair value	2,243,258	2,096,600
Total Short-Term Investments [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Fair value	1,535,709	1,473,479
Total Short-Term Investments [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Fair value	707,549	623,121
Equities [Member]
Financial Instruments [Line Items]
Fair value	7,945	7,443
Equities [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Fair value	7,945	7,443
Mutual Funds [Member]
Financial Instruments [Line Items]
Fair value	18,164	19,467
Mutual Funds [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Fair value	18,164	19,467
Total [Member]
Financial Instruments [Line Items]
Total	2,270,369	2,125,504
Total [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Total	1,561,818	1,500,389
Total [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Total	$ 708,551	$ 625,115