Marketable Securities (Tables)

9 Months Ended

Dec. 29, 2012

Marketable Securities [Abstract]

Schedule Of Available-for-sale Securities

							Estimated
			Gross		Gross		Fair Value
	Amortized		Unrealized		Unrealized		(Net Carrying
	Cost		Gains		Losses		Amount)
Corporate debt securities	$	19,453	$	6	$	(3)	$	19,456
U.S. Treasury securities		17,190		2		-		17,192
Agency discount notes		2,000		-		-		2,000
Commercial paper		22,077		5		(13)		22,069
Total securities	$	60,720	$	13	$	(16)	$	60,717

							Estimated
			Gross		Gross		Fair Value
	Amortized		Unrealized		Unrealized		(Net Carrying
	Cost		Gains		Losses		Amount)
Corporate debt securities	$	48,011	$	33	$	(19)	$	48,025
U.S. Treasury securities		30,264		1		(4)		30,261
Agency discount notes		16,789		8		(1)		16,796
Commercial paper		23,719		5		(15)		23,709
Total securities	$	118,783	$	47	$	(39)	$	118,791