Marketable Securities - Schedule of Unrealized Losses by Investment Category (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fair value of less than 12 months	$ 64,323	$ 38,753
Unrealized losses of less than 12 months	(286)	(75)
Fair value of 12 months or greater	2,838
Unrealized losses of 12 months or greater	(42)
Fair value, Total	67,161	38,753
Unrealized losses, Total	(328)	(75)
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of less than 12 months	26,879	4,502
Unrealized losses of less than 12 months	(55)	(1)
Fair value of 12 months or greater
Unrealized losses of 12 months or greater
Fair value, Total	26,879	4,502
Unrealized losses, Total	(55)	(1)
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of less than 12 months	19,906	24,203
Unrealized losses of less than 12 months	(72)	(30)
Fair value of 12 months or greater
Unrealized losses of 12 months or greater
Fair value, Total	19,906	24,203
Unrealized losses, Total	(72)	(30)
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of less than 12 months	11,261	10,048
Unrealized losses of less than 12 months	(145)	(44)
Fair value of 12 months or greater	2,838
Unrealized losses of 12 months or greater	(42)
Fair value, Total	14,099	10,048
Unrealized losses, Total	(187)	(44)
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of less than 12 months	2,955
Unrealized losses of less than 12 months	(5)
Fair value of 12 months or greater
Unrealized losses of 12 months or greater
Fair value, Total	2,955
Unrealized losses, Total	(5)
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of less than 12 months	3,322
Unrealized losses of less than 12 months	(9)
Fair value of 12 months or greater
Unrealized losses of 12 months or greater
Fair value, Total	3,322
Unrealized losses, Total	$ (9)