Financial Instruments - Schedule of Cash, Cash Equivalents, Short-Term Investments and Restricted Cash and Investments Unrealized Loss Positions (Detail) $ in Thousands	Jun. 26, 2016 USD ($)
Fair Value
Unrealized Losses Less Than 12 Months	$ 365,004
Unrealized Losses 12 Months or Greater	56,262
Total	421,266
Gross Unrealized Loss
Unrealized Losses Less Than 12 Months	(913)
Unrealized Losses 12 Months or Greater	(397)
Total	(1,310)
Municipal Notes and Bonds
Fair Value
Unrealized Losses Less Than 12 Months	43,084
Unrealized Losses 12 Months or Greater	1,994
Total	45,078
Gross Unrealized Loss
Unrealized Losses Less Than 12 Months	(10)
Unrealized Losses 12 Months or Greater	(6)
Total	(16)
US Treasury and Agencies
Fair Value
Unrealized Losses Less Than 12 Months	65,997
Unrealized Losses 12 Months or Greater	0
Total	65,997
Gross Unrealized Loss
Unrealized Losses Less Than 12 Months	(2)
Unrealized Losses 12 Months or Greater	0
Total	(2)
Retail Funds
Fair Value
Unrealized Losses Less Than 12 Months	7,539
Unrealized Losses 12 Months or Greater	0
Total	7,539
Gross Unrealized Loss
Unrealized Losses Less Than 12 Months	(397)
Unrealized Losses 12 Months or Greater	0
Total	(397)
Government-Sponsored Enterprises
Fair Value
Unrealized Losses Less Than 12 Months	1,211
Unrealized Losses 12 Months or Greater	0
Total	1,211
Gross Unrealized Loss
Unrealized Losses Less Than 12 Months	(13)
Unrealized Losses 12 Months or Greater	0
Total	(13)
Foreign Government Bonds
Fair Value
Unrealized Losses Less Than 12 Months	9,201
Unrealized Losses 12 Months or Greater	0
Total	9,201
Gross Unrealized Loss
Unrealized Losses Less Than 12 Months	(4)
Unrealized Losses 12 Months or Greater	0
Total	(4)
Corporate Notes and Bonds
Fair Value
Unrealized Losses Less Than 12 Months	185,982
Unrealized Losses 12 Months or Greater	46,761
Total	232,743
Gross Unrealized Loss
Unrealized Losses Less Than 12 Months	(317)
Unrealized Losses 12 Months or Greater	(249)
Total	(566)
Mortgage Backed Securities - Residential
Fair Value
Unrealized Losses Less Than 12 Months	12,402
Unrealized Losses 12 Months or Greater	1,328
Total	13,730
Gross Unrealized Loss
Unrealized Losses Less Than 12 Months	(68)
Unrealized Losses 12 Months or Greater	(84)
Total	(152)
Mortgage Backed Securities - Commercial
Fair Value
Unrealized Losses Less Than 12 Months	39,588
Unrealized Losses 12 Months or Greater	6,179
Total	45,767
Gross Unrealized Loss
Unrealized Losses Less Than 12 Months	(102)
Unrealized Losses 12 Months or Greater	(58)
Total	$ (160)