Schedule of Cash, Cash Equivalents, Investments and Restricted Cash and Investments Unrealized Loss Positions (Detail) $ in Thousands	Mar. 27, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	$ 1,099,561
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(3,720)
Unrealized Losses 12 Months or Greater - Fair Value	73,929
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss	(769)
Total - Fair Value	1,173,490
Total - Gross Unrealized Loss	(4,489)
Municipal Notes and Bonds
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	112,394
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(97)
Unrealized Losses 12 Months or Greater - Fair Value	2,316
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss	(5)
Total - Fair Value	114,710
Total - Gross Unrealized Loss	(102)
U.S. Treasury & Agencies
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	150,745
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(246)
Total - Fair Value	150,745
Total - Gross Unrealized Loss	(246)
Mutual Funds
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	14,750
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(479)
Total - Fair Value	14,750
Total - Gross Unrealized Loss	(479)
Government-Sponsored Enterprises
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	16,007
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(26)
Total - Fair Value	16,007
Total - Gross Unrealized Loss	(26)
Foreign Government Bonds
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	32,008
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(73)
Total - Fair Value	32,008
Total - Gross Unrealized Loss	(73)
Corporate Notes and Bonds
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	680,632
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(2,213)
Unrealized Losses 12 Months or Greater - Fair Value	51,998
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss	(413)
Total - Fair Value	732,630
Total - Gross Unrealized Loss	(2,626)
Mortgage Backed Securities — Residential
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	18,159
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(137)
Unrealized Losses 12 Months or Greater - Fair Value	8,187
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss	(215)
Total - Fair Value	26,346
Total - Gross Unrealized Loss	(352)
Mortgage Backed Securities — Commercial
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	74,866
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(449)
Unrealized Losses 12 Months or Greater - Fair Value	11,428
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss	(136)
Total - Fair Value	86,294
Total - Gross Unrealized Loss	$ (585)