Marketable Securities - Schedule of Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	$ 186,568	$ 357,608
Available-for-sale securities, Gross Unrealized Gains	543	2,441
Available-for-sale securities, Gross Unrealized Losses	(328)	(75)
Available-for-sale securities, Estimated Fair Value	186,783	359,974
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	49,237	113,033
Available-for-sale securities, Gross Unrealized Gains	16	327
Available-for-sale securities, Gross Unrealized Losses	(55)	(1)
Available-for-sale securities, Estimated Fair Value	49,198	113,359
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	74,386	153,460
Available-for-sale securities, Gross Unrealized Gains	200	1,429
Available-for-sale securities, Gross Unrealized Losses	(72)	(30)
Available-for-sale securities, Estimated Fair Value	74,514	154,859
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	32,778	50,852
Available-for-sale securities, Gross Unrealized Gains	191	473
Available-for-sale securities, Gross Unrealized Losses	(187)	(44)
Available-for-sale securities, Estimated Fair Value	32,782	51,281
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	5,178	602
Available-for-sale securities, Gross Unrealized Gains	3	1
Available-for-sale securities, Gross Unrealized Losses	(5)
Available-for-sale securities, Estimated Fair Value	5,176	603
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	24,989	39,661
Available-for-sale securities, Gross Unrealized Gains	133	211
Available-for-sale securities, Gross Unrealized Losses	(9)
Available-for-sale securities, Estimated Fair Value	$ 25,113	$ 39,872