Schedule of Amortized Cost and Fair Value of Cash Equivalents, Short-Term Investments and Restricted Investments with Contractual Maturities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Due in one year or less, cost	$ 1,596,931
Due after one year through five years, cost	1,724,707
Due in more than five years, cost	364,179
Cost	3,685,817
Due in one year or less, estimated fair value	1,597,205
Due after one year through five years, estimated fair value	1,726,108
Due in more than five years, estimated fair value	363,392
Estimated fair value due, Total	$ 3,686,705