Contractual Maturities of Investments Held (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014
Schedule of Available-for-sale Securities
Due within one year, cost	$ 462,031
Due after 1 year through 5 years, cost	226,558
Due after 5 years through 10 years, cost	5,854
Due after 10 years, cost	24,602
Total, cost	719,045
Due within one year, fair value	462,150
Due after 1 year through 5 years, fair value	226,607
Due after 5 years through 10 years, fair value	5,954
Due after 10 years, fair value	25,336
Total, fair value	$ 720,047