Investments (Tables)

12 Months Ended

Mar. 29, 2015

Investments, Debt and Equity Securities [Abstract]

Available-for-sale investments at March 29, 2015 were as follows:



(in thousands)	Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government treasuries and agencies securities	$	135,570		$	398	$	(23	)	$	135,945
Money market funds	55,578			—		—			55,578
Asset-backed securities	31,830			9		(9		)	31,830
Corporate bonds	245,229			567		(121		)	245,675
International government bonds	1,010			—		(4		)	1,006
Corporate commercial paper	4,999			—		—			4,999
Bank deposits	16,915			—		—			16,915
Repurchase agreements	191			—		—			191
Municipal bonds	6,001			45		(2		)	6,044
Total available-for-sale investments	497,323			1,019		(159		)	498,183
Less amounts classified as cash equivalents	(60,068		)	—		—			(60,068		)
Short-term investments	$	437,255		$	1,019	$	(159	)	$	438,115

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	(62,671		)	—		—			(62,671		)
Short-term investments	$	362,004		$	454	$	(254	)	$	362,204

Contractual Maturity of Available-For-Sale Debt Securities

The cost and estimated fair value of available-for-sale debt securities at March 29, 2015, by contractual maturity, were as follows:



(in thousands)	Amortized Cost		Estimated Fair Value
Due in 1 year or less	$	153,753	$	153,823
Due in 1-2 years	132,241		132,529
Due in 2-5 years	211,329		211,831
Total investments in available-for-sale debt securities	$	497,323	$	498,183

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

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 29, 2015, 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	$	67,367	$	(121	)	$	—	$	—	$	67,367	$	(121	)
Asset-backed securities	17,736		(9		)	—		—		17,736		(9		)
U.S. government treasuries and agencies securities	18,478		(23		)	—		—		18,478		(23		)
Municipal bonds	1,001		(2		)	—		—		1,001		(2		)
International government bonds	1,006		(4		)	—		—		1,006		(4		)
Total	$	105,588	$	(159	)	$	—	$	—	$	105,588	$	(159	)

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 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	$	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	)