Investments (Tables)

12 Months Ended

Mar. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Available-for-sale investments at March 30, 2014 were as follows:



(in thousands)	Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government treasuries and agencies securities	$	112,268		$	76	$	(91	)	$	112,253
Money market funds	53,430			—		—			53,430
Asset-backed securities	22,330			11		(9		)	22,332
Corporate bonds	199,598			335		(127		)	199,806
International government bonds	3,023			—		(9		)	3,014
Corporate commercial paper	6,246			—		—			6,246
Bank deposits	18,538			—		—			18,538
Repurchase agreements	46			—		—			46
Municipal bonds	9,196			32		(18		)	9,210
Total available-for-sale investments	424,675			454		(254		)	424,875
Less amounts classified as cash equivalents	(62,271		)	—		—			(62,271		)
Short-term investments	$	362,404		$	454	$	(254	)	$	362,604

Available-for-sale investments at March 31, 2013 were as follows:



(in thousands)	Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government treasuries and agencies securities	$	87,356		$	24	$	(1	)	$	87,379
Money market funds	79,083			—		—			79,083
Asset-backed securities	9,860			2		(7		)	9,855
Corporate bonds	58,733			33		(50		)	58,716
International government bonds	3,069			1		(4		)	3,066
Bank deposits	16,583			—		—			16,583
Municipal bonds	2,089			5		—			2,094
Total available-for-sale investments	256,773			65		(62		)	256,776
Less amounts classified as cash equivalents	(90,443		)	—		—			(90,443		)
Short-term investments	$	166,330		$	65	$	(62	)	$	166,333

Contractual Maturity of Available-For-Sale Debt Securities

The cost and estimated fair value of available-for-sale debt securities at March 30, 2014, by contractual maturity, were as follows:



(in thousands)	Amortized Cost		Estimated Fair Value
Due in 1 year or less	$	173,850	$	173,891
Due in 1-2 years	101,275		101,378
Due in 2-5 years	149,550		149,606
Total investments in available-for-sale debt securities	$	424,675	$	424,875

The cost and estimated fair value of available-for-sale debt securities at March 31, 2013, by contractual maturity, were as follows:



(in thousands)	Amortized Cost		Estimated Fair Value
Due in 1 year or less	$	186,747	$	186,771
Due in 1-2 years	25,053		25,038
Due in 2-5 years	44,973		44,967
Total investments in available-for-sale debt securities	$	256,773	$	256,776

Gross Unrealized Losses and Fair Value of Investments in Continuous Loss Position

The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses as of March 30, 2014, aggregated by investment category and length of time that individual securities have been in a continuous loss position.



	Less Than 12 Months					12 Months or Greater				Total
(in thousands)	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate bonds	$	52,783	$	(127	)	$	—	$	—	$	52,783	$	(127	)
Asset-backed securities	11,156		(9		)	—		—		11,156		(9		)
U.S. government treasuries and agencies securities	36,403		(91		)	—		—		36,403		(91		)
Municipal bonds	$	4,000	$	(18	)	—		—		4,000		(18		)
International government bonds	3,014		(9		)	—		—		3,014		(9		)
Total	$	107,356	$	(254	)	$	—	$	—	$	107,356	$	(254	)

The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses, as of March 31, 2013, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.



	Less Than 12 Months					12 Months or Greater				Total
(in thousands)	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate bonds	$	32,009	$	(50	)	$	—	$	—	$	32,009	$	(50	)
Asset-backed securities	6,473		(7		)					6,473		(7		)
U.S. government treasuries and agencies securities	3,324		(1		)	—		—		3,324		(1		)
International government bonds	1,007		(4		)	—		—		1,007		(4		)
Total	$	42,813	$	(62	)	$	—	$	—	$	42,813	$	(62	)