Marketable Securities - Schedule of Unrealized Losses by Investment Category (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2015	Mar. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	$ 50,123	$ 64,323
Unrealized Losses of Less Than 12 Months	(73)	(286)
Fair Value of 12 Months or Greater	4,581	2,838
Unrealized Losses of 12 Months or Greater	(28)	(42)
Fair Value, Total	54,704	67,161
Unrealized Losses, Total	(101)	(328)
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	16,607	26,879
Unrealized Losses of Less Than 12 Months	(12)	(55)
Fair Value, Total	16,607	26,879
Unrealized Losses, Total	(12)	(55)
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	28,421	19,906
Unrealized Losses of Less Than 12 Months	(51)	(72)
Fair Value, Total	28,421	19,906
Unrealized Losses, Total	(51)	(72)
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	4,174	11,261
Unrealized Losses of Less Than 12 Months	(8)	(145)
Fair Value of 12 Months or Greater	4,581	2,838
Unrealized Losses of 12 Months or Greater	(28)	(42)
Fair Value, Total	8,755	14,099
Unrealized Losses, Total	(36)	(187)
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	921	3,322
Unrealized Losses of Less Than 12 Months	(2)	(9)
Fair Value, Total	921	3,322
Unrealized Losses, Total	(2)	(9)
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, Total		2,955
Unrealized Losses, Total		$ (5)

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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