Marketable Securities - Schedule of Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2015	Mar. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	$ 200,579	$ 186,568
Available-for-sale securities, Gross Unrealized Gains	696	543
Available-for-sale securities, Gross Unrealized Losses	(101)	(328)
Available-for-sale securities, Estimated Fair Value	201,174	186,783
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	54,279	49,237
Available-for-sale securities, Gross Unrealized Gains	173	16
Available-for-sale securities, Gross Unrealized Losses	(12)	(55)
Available-for-sale securities, Estimated Fair Value	54,440	49,198
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	99,117	74,386
Available-for-sale securities, Gross Unrealized Gains	257	200
Available-for-sale securities, Gross Unrealized Losses	(51)	(72)
Available-for-sale securities, Estimated Fair Value	99,323	74,514
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	26,676	32,778
Available-for-sale securities, Gross Unrealized Gains	182	191
Available-for-sale securities, Gross Unrealized Losses	(36)	(187)
Available-for-sale securities, Estimated Fair Value	26,822	32,782
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	16,647	24,989
Available-for-sale securities, Gross Unrealized Gains	76	133
Available-for-sale securities, Gross Unrealized Losses	(2)	(9)
Available-for-sale securities, Estimated Fair Value	16,721	25,113
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	3,860	5,178
Available-for-sale securities, Gross Unrealized Gains	8	3
Available-for-sale securities, Gross Unrealized Losses		(5)
Available-for-sale securities, Estimated Fair Value	$ 3,868	$ 5,176

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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