Financial Instruments - Schedule of Cash, Cash Equivalents, Short-Term Investments and Restricted Cash and Investments Unrealized Loss Positions (Detail) $ in Thousands	Jun. 25, 2017 USD ($)
Fair Value
Unrealized Losses Less than 12 Months	$ 1,729,287
Unrealized Losses 12 Months or Greater	3,341
Total	1,732,628
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(4,803)
Unrealized Losses 12 Months or Greater	(29)
Total	(4,832)
U.S. Treasury and agencies
Fair Value
Unrealized Losses Less than 12 Months	539,374
Unrealized Losses 12 Months or Greater	0
Total	539,374
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(2,278)
Unrealized Losses 12 Months or Greater	0
Total	(2,278)
Municipal notes and bonds
Fair Value
Unrealized Losses Less than 12 Months	7,905
Unrealized Losses 12 Months or Greater	0
Total	7,905
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(7)
Unrealized Losses 12 Months or Greater	0
Total	(7)
Government-sponsored enterprises
Fair Value
Unrealized Losses Less than 12 Months	20,104
Unrealized Losses 12 Months or Greater	506
Total	20,610
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(2)
Unrealized Losses 12 Months or Greater	(4)
Total	(6)
Foreign government bonds
Fair Value
Unrealized Losses Less than 12 Months	26,227
Unrealized Losses 12 Months or Greater	0
Total	26,227
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(114)
Unrealized Losses 12 Months or Greater	0
Total	(114)
Corporate notes and bonds
Fair Value
Unrealized Losses Less than 12 Months	998,793
Unrealized Losses 12 Months or Greater	127
Total	998,920
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(1,840)
Unrealized Losses 12 Months or Greater	0
Total	(1,840)
Mortgage backed securities - residential
Fair Value
Unrealized Losses Less than 12 Months	86,870
Unrealized Losses 12 Months or Greater	1,369
Total	88,239
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(468)
Unrealized Losses 12 Months or Greater	(21)
Total	(489)
Mortgage backed securities - commercial
Fair Value
Unrealized Losses Less than 12 Months	50,014
Unrealized Losses 12 Months or Greater	1,339
Total	51,353
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(94)
Unrealized Losses 12 Months or Greater	(4)
Total	$ (98)