Marketable Securities - Schedule of Unrealized Losses by Investment Category (Detail) - USD ($) $ in Thousands	Dec. 27, 2015	Mar. 29, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	$ 175,140	$ 50,123
Unrealized Losses of Less Than 12 Months	(659)	(73)
Fair Value of 12 Months or Greater	3,318	4,581
Unrealized Losses of 12 Months or Greater	(25)	(28)
Fair Value, Total	178,458	54,704
Unrealized Losses, Total	(684)	(101)
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	83,818	16,607
Unrealized Losses of Less Than 12 Months	(311)	(12)
Fair Value, Total	83,818	16,607
Unrealized Losses, Total	(311)	(12)
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	76,465	28,421
Unrealized Losses of Less Than 12 Months	(274)	(51)
Fair Value of 12 Months or Greater	1,417
Unrealized Losses of 12 Months or Greater	(9)
Fair Value, Total	77,882	28,421
Unrealized Losses, Total	(283)	(51)
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	10,112	4,174
Unrealized Losses of Less Than 12 Months	(59)	(8)
Fair Value of 12 Months or Greater	1,901	4,581
Unrealized Losses of 12 Months or Greater	(16)	(28)
Fair Value, Total	12,013	8,755
Unrealized Losses, Total	(75)	(36)
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	3,087	921
Unrealized Losses of Less Than 12 Months	(10)	(2)
Fair Value, Total	3,087	921
Unrealized Losses, Total	(10)	$ (2)
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	1,658
Unrealized Losses of Less Than 12 Months	(5)
Fair Value, Total	1,658
Unrealized Losses, Total	$ (5)