Fair Value of Financial Instruments (Tables)

6 Months Ended

Sep. 29, 2012

Fair Value Of Financial Instruments [Abstract]

Schedule Of Fair Value Of Financial Assets

	Quoted Prices
	in Active		Significant
	Markets for		Other		Significant
	Identical		Observable		Unobservable
	Assets		Inputs		Inputs
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	28,736	$	-	$	-	$	28,736
U.S. Treasury securities		15,000		-		-		15,000
Commercial paper		-		8,899		-		8,899
	$	43,736	$	8,899	$	-	$	52,635
Available-for-sale securities
Corporate debt securities	$	-	$	29,979	$	-	$	29,979
U.S. Treasury securities		16,730		-		-		16,730
Agency discount notes		-		8,504		-		8,504
Commercial paper		-		11,518		-		11,518
	$	16,730	$	50,001	$	-	$	66,731

	Quoted Prices
	in Active		Significant
	Markets for		Other		Significant
	Identical		Observable		Unobservable
	Assets		Inputs		Inputs
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	40,557	$	-	$	-	$	40,557
Commercial paper		-		15,952		-		15,952
Corporate debt securities		-		1,112		-		1,112
	$	40,557	$	17,064	$	-	$	57,621
Available-for-sale securities
Corporate debt securities	$	-	$	48,025	$	-	$	48,025
U.S. Treasury securities		30,261		-		-		30,261
Agency discount notes		-		16,796		-		16,796
Commercial paper		-		23,709		-		23,709
	$	30,261	$	88,530	$	-	$	118,791