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Schedule of Cash, Cash Equivalents, Short-Term Investments and Restricted Cash and Investments Unrealized Loss Positions (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2014
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value $ 634,021
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (1,687)
Unrealized Losses 12 Months or Greater - Fair Value 27,374
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss (337)
Total - Fair Value 661,395
Total - Gross Unrealized Loss (2,024)
Municipal Notes And Bonds
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 13,717
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (12)
Total - Fair Value 13,717
Total - Gross Unrealized Loss (12)
Corporate Notes And Bonds
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 431,132
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (1,072)
Unrealized Losses 12 Months or Greater - Fair Value 3,525
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss (27)
Total - Fair Value 434,657
Total - Gross Unrealized Loss (1,099)
US Treasury and Agencies
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 58,326
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (98)
Total - Fair Value 58,326
Total - Gross Unrealized Loss (98)
Government-Sponsored Enterprises
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 36,960
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (68)
Total - Fair Value 36,960
Total - Gross Unrealized Loss (68)
Foreign Government Bonds
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 20,566
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (46)
Total - Fair Value 20,566
Total - Gross Unrealized Loss (46)
Mortgage Backed Securities - Residential
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 4,252
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (83)
Unrealized Losses 12 Months or Greater - Fair Value 4,487
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss (69)
Total - Fair Value 8,739
Total - Gross Unrealized Loss (152)
Mortgage Backed Securities - Commercial
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 69,068
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (308)
Unrealized Losses 12 Months or Greater - Fair Value 19,362
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss (241)
Total - Fair Value 88,430
Total - Gross Unrealized Loss $ (549)