FINANCIAL INSTRUMENTS - Schedule of Cash, Cash Equivalents, Investments and Restricted Cash and Investments Unrealized Loss Positions (Detail) $ in Thousands	Sep. 25, 2016 USD ($)
Fair Value
Unrealized Losses Less Than 12 Months	$ 307,719
Unrealized Losses 12 Months or Greater	69,600
Total	377,319
Unrealized Losses 12 Months or Greater
Unrealized Losses Less Than 12 Months	(297)
Unrealized Losses 12 Months or Greater	(451)
Total	(748)
Municipal Notes and Bonds
Fair Value
Unrealized Losses Less Than 12 Months	110,401
Unrealized Losses 12 Months or Greater	1,995
Total	112,396
Unrealized Losses 12 Months or Greater
Unrealized Losses Less Than 12 Months	(71)
Unrealized Losses 12 Months or Greater	(5)
Total	(76)
U.S. Treasury & Agencies
Fair Value
Unrealized Losses Less Than 12 Months	8,247
Unrealized Losses 12 Months or Greater	0
Total	8,247
Unrealized Losses 12 Months or Greater
Unrealized Losses Less Than 12 Months	(3)
Unrealized Losses 12 Months or Greater	0
Total	(3)
Mutual Funds
Fair Value
Unrealized Losses Less Than 12 Months	0
Unrealized Losses 12 Months or Greater	8,964
Total	8,964
Unrealized Losses 12 Months or Greater
Unrealized Losses Less Than 12 Months	0
Unrealized Losses 12 Months or Greater	(195)
Total	(195)
Government-Sponsored Enterprises
Fair Value
Unrealized Losses Less Than 12 Months	419
Unrealized Losses 12 Months or Greater	621
Total	1,040
Unrealized Losses 12 Months or Greater
Unrealized Losses Less Than 12 Months	0
Unrealized Losses 12 Months or Greater	(14)
Total	(14)
Foreign Government Bonds
Fair Value
Unrealized Losses Less Than 12 Months	4,250
Unrealized Losses 12 Months or Greater	0
Total	4,250
Unrealized Losses 12 Months or Greater
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	147,348
Unrealized Losses 12 Months or Greater	47,805
Total	195,153
Unrealized Losses 12 Months or Greater
Unrealized Losses Less Than 12 Months	(83)
Unrealized Losses 12 Months or Greater	(118)
Total	(201)
Mortgage Backed Securities — Residential
Fair Value
Unrealized Losses Less Than 12 Months	8,469
Unrealized Losses 12 Months or Greater	3,897
Total	12,366
Unrealized Losses 12 Months or Greater
Unrealized Losses Less Than 12 Months	(57)
Unrealized Losses 12 Months or Greater	(84)
Total	(141)
Mortgage Backed Securities — Commercial
Fair Value
Unrealized Losses Less Than 12 Months	28,585
Unrealized Losses 12 Months or Greater	6,318
Total	34,903
Unrealized Losses 12 Months or Greater
Unrealized Losses Less Than 12 Months	(82)
Unrealized Losses 12 Months or Greater	(35)
Total	$ (117)