Marketable Securities - Schedule of Unrealized Losses by Investment Category (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	$ 73,276	$ 64,323
Unrealized Losses of Less Than 12 Months	(173)	(286)
Fair Value of 12 Months or Greater	7,382	2,838
Unrealized Losses of 12 Months or Greater	(78)	(42)
Fair Value, Total	80,658	67,161
Unrealized Losses, Total	(251)	(328)
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	26,232	26,879
Unrealized Losses of Less Than 12 Months	(40)	(55)
Fair Value of 12 Months or Greater	677
Unrealized Losses of 12 Months or Greater	(3)
Fair Value, Total	26,909	26,879
Unrealized Losses, Total	(43)	(55)
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	28,999	19,906
Unrealized Losses of Less Than 12 Months	(70)	(72)
Fair Value, Total	28,999	19,906
Unrealized Losses, Total	(70)	(72)
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	8,552	11,261
Unrealized Losses of Less Than 12 Months	(34)	(145)
Fair Value of 12 Months or Greater	6,705	2,838
Unrealized Losses of 12 Months or Greater	(75)	(42)
Fair Value, Total	15,257	14,099
Unrealized Losses, Total	(109)	(187)
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	6,594	2,955
Unrealized Losses of Less Than 12 Months	(20)	(5)
Fair Value, Total	6,594	2,955
Unrealized Losses, Total	(20)	(5)
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	2,899	3,322
Unrealized Losses of Less Than 12 Months	(9)	(9)
Fair Value, Total	2,899	3,322
Unrealized Losses, Total	$ (9)	$ (9)