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Schedule of Cash, Cash Equivalents, Short-Term Investments and Restricted Cash and Investments Unrealized Loss Positions (Detail)
$ in Thousands
Jun. 28, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value $ 1,666,588
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (6,034)
Unrealized Losses 12 Months or Greater - Fair Value 38,505
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss (318)
Total - Fair Value 1,705,093
Total - Gross Unrealized Loss (6,352)
Municipal Notes And Bonds  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 272,388
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (335)
Total - Fair Value 272,388
Total - Gross Unrealized Loss (335)
Corporate Notes And Bonds  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 889,064
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (3,750)
Unrealized Losses 12 Months or Greater - Fair Value 16,586
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss (47)
Total - Fair Value 905,650
Total - Gross Unrealized Loss (3,797)
US Treasury and Agencies  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 296,237
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (865)
Total - Fair Value 296,237
Total - Gross Unrealized Loss (865)
Retail Funds  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 3,532
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (47)
Total - Fair Value 3,532
Total - Gross Unrealized Loss (47)
Government-Sponsored Enterprises  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 49,184
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (249)
Total - Fair Value 49,184
Total - Gross Unrealized Loss (249)
Foreign Government Bonds  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 34,882
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (161)
Total - Fair Value 34,882
Total - Gross Unrealized Loss (161)
Mortgage Backed Securities - Residential  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 20,913
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (196)
Unrealized Losses 12 Months or Greater - Fair Value 2,190
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss (96)
Total - Fair Value 23,103
Total - Gross Unrealized Loss (292)
Mortgage Backed Securities - Commercial  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized Losses Less Than 12 Months - Fair Value 100,388
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss (431)
Unrealized Losses 12 Months or Greater - Fair Value 19,729
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss (175)
Total - Fair Value 120,117
Total - Gross Unrealized Loss $ (606)