Marketable Securities - Schedule of Unrealized Losses by Investment Category (Detail) - USD ($) $ in Thousands	Sep. 27, 2015	Mar. 29, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	$ 74,785	$ 50,123
Unrealized Losses of Less Than 12 Months	(186)	(73)
Fair Value of 12 Months or Greater	1,730	4,581
Unrealized Losses of 12 Months or Greater	(10)	(28)
Fair Value, Total	76,515	54,704
Unrealized Losses, Total	(196)	(101)
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	17,998	16,607
Unrealized Losses of Less Than 12 Months	(8)	(12)
Fair Value, Total	17,998	16,607
Unrealized Losses, Total	(8)	(12)
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	48,435	28,421
Unrealized Losses of Less Than 12 Months	(143)	(51)
Fair Value, Total	48,435	28,421
Unrealized Losses, Total	(143)	(51)
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	6,944	4,174
Unrealized Losses of Less Than 12 Months	(32)	(8)
Fair Value of 12 Months or Greater	1,730	4,581
Unrealized Losses of 12 Months or Greater	(10)	(28)
Fair Value, Total	8,674	8,755
Unrealized Losses, Total	(42)	(36)
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	1,408	921
Unrealized Losses of Less Than 12 Months	(3)	(2)
Fair Value, Total	1,408	921
Unrealized Losses, Total	$ (3)	$ (2)