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Summary of Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 29, 2014
Jun. 30, 2013
Financial Instruments [Line Items]    
Estimated Fair Value $ 2,927,105 $ 2,224,942
Municipal Notes And Bonds
    
Financial Instruments [Line Items]    
Cost 334,329 268,390
Unrealized Gain 1,108 805
Unrealized (Loss) (4) (449)
Estimated Fair Value 335,433 268,746
Corporate Notes And Bonds
    
Financial Instruments [Line Items]    
Cost 1,007,089 861,109
Unrealized Gain 2,034 1,328
Unrealized (Loss) (335) (1,945)
Estimated Fair Value 1,008,788 860,492
Short-term Investments
    
Financial Instruments [Line Items]    
Cost 1,610,790 1,335,868
Unrealized Gain 3,577 2,718
Unrealized (Loss) (1,400) (3,841)
Estimated Fair Value 1,612,967 1,334,745
Cash
    
Financial Instruments [Line Items]    
Cost 285,031 438,813
Estimated Fair Value 285,031 438,813
Fixed Income Money Market Funds
    
Financial Instruments [Line Items]    
Cost 1,168,261 725,311
Estimated Fair Value 1,168,261 725,311
US Treasury and Agencies
    
Financial Instruments [Line Items]    
Cost 212,436 155,648
Unrealized Gain 178 18
Unrealized (Loss) (27) (373)
Estimated Fair Value 212,587 155,293
Government-Sponsored Enterprises
    
Financial Instruments [Line Items]    
Cost 27,666 54,835
Unrealized Gain 41 65
Unrealized (Loss) (15) (95)
Estimated Fair Value 27,692 54,805
Foreign Government Bonds
    
Financial Instruments [Line Items]    
Cost 35,438 24,950
Unrealized Gain 57 47
Unrealized (Loss) (28) (25)
Estimated Fair Value 35,467 24,972
Mortgage Backed Securities - Residential
    
Financial Instruments [Line Items]    
Cost 27,067 27,618
Unrealized Gain 59 29
Unrealized (Loss) (182) (282)
Estimated Fair Value 26,944 27,365
Mortgage Backed Securities - Commercial
    
Financial Instruments [Line Items]    
Cost 112,642 108,204
Unrealized Gain 100 426
Unrealized (Loss) (809) (672)
Estimated Fair Value 111,933 107,958
Cash And Short Term Investments [Member]
    
Financial Instruments [Line Items]    
Cost 3,209,959 2,664,878
Unrealized Gain 3,577 2,718
Unrealized (Loss) (1,400) (3,841)
Estimated Fair Value 3,212,136 2,663,755
Publicly Traded Equity Securities
    
Financial Instruments [Line Items]    
Cost   5,610
Unrealized Gain   1,486
Estimated Fair Value   7,096
Private Equity Securities
    
Financial Instruments [Line Items]    
Cost   5,000
Estimated Fair Value   5,000
Mutual Funds
    
Financial Instruments [Line Items]    
Cost 18,784 16,611
Unrealized Gain 2,974 1,619
Unrealized (Loss)   (14)
Estimated Fair Value 21,758 18,216
Financial Instruments
    
Financial Instruments [Line Items]    
Cost 3,228,743 2,692,099
Unrealized Gain 6,551 5,823
Unrealized (Loss) (1,400) (3,855)
Estimated Fair Value 3,233,894 2,694,067
Cash and Cash Equivalents
    
Financial Instruments [Line Items]    
Cost 1,452,677 1,162,473
Estimated Fair Value 1,452,677 1,162,473
Restricted Cash And Investments
    
Financial Instruments [Line Items]    
Cost 146,492 166,536
Estimated Fair Value 146,492 166,536
Other Assets
    
Financial Instruments [Line Items]    
Cost 18,784 27,222
Unrealized Gain 2,974 3,105
Unrealized (Loss)   (14)
Estimated Fair Value $ 21,758 $ 30,313