Marketable Securities - Schedule of Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Mar. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	$ 189,010	$ 186,568
Available-for-sale securities, Gross Unrealized Gains	677	543
Available-for-sale securities, Gross Unrealized Losses	(155)	(328)
Available-for-sale securities, Estimated Fair Value	189,532	186,783
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	47,919	49,237
Available-for-sale securities, Gross Unrealized Gains	36	16
Available-for-sale securities, Gross Unrealized Losses	(16)	(55)
Available-for-sale securities, Estimated Fair Value	47,939	49,198
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	77,041	74,386
Available-for-sale securities, Gross Unrealized Gains	241	200
Available-for-sale securities, Gross Unrealized Losses	(31)	(72)
Available-for-sale securities, Estimated Fair Value	77,251	74,514
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	32,029	32,778
Available-for-sale securities, Gross Unrealized Gains	228	191
Available-for-sale securities, Gross Unrealized Losses	(98)	(187)
Available-for-sale securities, Estimated Fair Value	32,159	32,782
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	8,619	5,178
Available-for-sale securities, Gross Unrealized Gains	8	3
Available-for-sale securities, Gross Unrealized Losses	(5)	(5)
Available-for-sale securities, Estimated Fair Value	8,622	5,176
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	23,402	24,989
Available-for-sale securities, Gross Unrealized Gains	164	133
Available-for-sale securities, Gross Unrealized Losses	(5)	(9)
Available-for-sale securities, Estimated Fair Value	$ 23,561	$ 25,113