Marketable Securities (Tables)

3 Months Ended

Jun. 29, 2013

Marketable Securities [Abstract]

Schedule Of Available-for-sale Securities

								Estimated
				Gross		Gross		Fair Value
		Amortized		Unrealized		Unrealized	(Net Carrying
As of June 29, 2013		Cost		Gains		Losses		Amount)
Corporate debt securities	$	122,901	$	1	$	(219)	$	122,683
U.S. Treasury securities		40,337		5		(3)		40,339
Agency discount notes		1,022		-		-		1,022
Commercial paper		40,876		29		(1)		40,904
Total securities	$	205,136	$	35	$	(223)	$	204,948

The Company’s specifically identified gross unrealized losses of $223 thousand relates to 58 different securities with total amortized cost of approximately $141.5 million at June 29, 2013.  Because the Company does not intend to sell the investments at a loss and the Company will not be required to sell the investments before recovery of its amortized cost basis, it did not consider the investment in these securities to be other-than-temporarily impaired at June 29, 2013.  Further, the securities with gross unrealized losses had been in a continuous unrealized loss position for less than 12 months as of June 29, 2013. 

The following table is a summary of available-for-sale securities at March 30, 2013 (in thousands):

							Estimated
			Gross		Gross		Fair Value
	Amortized		Unrealized		Unrealized		(Net Carrying
As of March 30, 2013	Cost		Gains		Losses		Amount)
Corporate debt securities	$	94,798	$	2	$	(133)	$	94,667
U.S. Treasury securities		34,380		4		(3)		34,381
Agency discount notes		1,027		-		-		1,027
Commercial paper		40,089		9		(28)		40,070
Total securities	$	170,294	$	15	$	(164)	$	170,145

Schedule of Cost And Estimated Fair Value Of Available-for-sale Securities By Contractual Maturity

		June 29, 2013				March 30, 2013
		Amortized		Estimated		Amortized		Estimated
		Cost		Fair Value		Cost		Fair Value
Within 1 year	$	165,625	$	165,540	$	105,290	$	105,235
After 1 year		39,511		39,408		65,004		64,910
Total	$	205,136	$	204,948	$	170,294	$	170,145