Schedule of Amortized Cost and Fair Value of Cash Equivalents, Investments, and Restricted Cash and Investments with Contractual Maturities (Detail) $ in Thousands	Sep. 27, 2015 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Due in one year or less, cost	$ 1,816,857
Due after one year through five years, cost	1,941,115
Due in more than five years, cost	200,772
Cost	3,958,744
Due in one year or less, estimated fair value	1,817,160
Due after one year through five years, estimated fair value	1,940,258
Due in more than five years, estimated fair value	200,138
Estimated fair value due, Total	$ 3,957,556