Financial Instruments - Schedule of Cash, Cash Equivalents, Short-Term Investments and Restricted Cash and Investments Unrealized Loss Positions (Details) $ in Thousands	Jun. 24, 2018 USD ($)
Fair Value
Unrealized Losses Less than 12 Months	$ 792,675
Unrealized Losses 12 Months or Greater	25,954
Total	818,629
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(1,818)
Unrealized Losses 12 Months or Greater	(162)
Total	(1,980)
U.S. Treasury and agencies
Fair Value
Unrealized Losses Less than 12 Months	332,903
Unrealized Losses 12 Months or Greater	11,026
Total	343,929
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(100)
Unrealized Losses 12 Months or Greater	(70)
Total	(170)
Municipal notes and bonds
Fair Value
Unrealized Losses Less than 12 Months	141,139
Unrealized Losses 12 Months or Greater	0
Total	141,139
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(279)
Unrealized Losses 12 Months or Greater	0
Total	(279)
Mutual funds
Fair Value
Unrealized Losses Less than 12 Months	25,312
Unrealized Losses 12 Months or Greater	0
Total	25,312
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(142)
Unrealized Losses 12 Months or Greater	0
Total	(142)
Government-sponsored enterprises
Fair Value
Unrealized Losses Less than 12 Months	110,722
Unrealized Losses 12 Months or Greater	0
Total	110,722
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(201)
Unrealized Losses 12 Months or Greater	0
Total	(201)
Foreign government bonds
Fair Value
Unrealized Losses Less than 12 Months	19,985
Unrealized Losses 12 Months or Greater	0
Total	19,985
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(1)
Unrealized Losses 12 Months or Greater	0
Total	(1)
Corporate notes and bonds
Fair Value
Unrealized Losses Less than 12 Months	161,813
Unrealized Losses 12 Months or Greater	14,928
Total	176,741
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(1,092)
Unrealized Losses 12 Months or Greater	(92)
Total	(1,184)
Mortgage backed securities - residential
Fair Value
Unrealized Losses Less than 12 Months	801
Unrealized Losses 12 Months or Greater	0
Total	801
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(3)
Unrealized Losses 12 Months or Greater	0
Total	$ (3)