Fair Value Measurements (Tables)

6 Months Ended

Sep. 29, 2012

Fair Value Hierarchy for Financial Assets Measured at Fair Value on Recurring Basis

The Company’s fair value hierarchy for its financial assets measured at fair value on a recurring basis as of September 29, 2012 and March 31, 2012 was as follows (in thousands):

September 29, 2012	Level 1		Level 2			Level 3		Total
Money market securities	$	12,761	$	—		$	—	$	12,761
Government agencies		—		83,056			—		83,056
Commercial paper		—		30,346			—		30,346
Corporate bonds		—		22,797			—		22,797
Forward purchase or (sale) contracts:
Japanese Yen		—		(87	)		—		(87	)
Taiwan Dollar		—		15			—		15
Korean Won		—		40			—		40
Euro		—		(90	)		—		(90	)
British Pound		—		63			—		63
Singapore Dollar		—		15			—		15
March 31, 2012	Level 1		Level 2			Level 3		Total
Money market securities	$	5,244	$	—		$	—	$	5,244
Commercial paper		—		83,645			—		83,645
Government agencies		—		67,261			—		67,261
Corporate Bonds		—		20,121			—		20,121
Forward purchase or (sale) contracts:
Japanese Yen		—		202			—		202
Taiwan Dollar		—		(5	)		—		(5	)
Korean Won		—		(17	)		—		(17	)
Euro		—		(1	)		—		(1	)
British Pound		—		20			—		20
Chinese Renminbi		—		(1	)		—		(1	)

Investments

Certain information regarding the Company’s investments at September 29, 2012 and March 31, 2012 was as follows (in thousands):

September 29, 2012			Unrealized
	Cost		Gain		Loss			Fair Value
Available-for-sale securities (current):
Government agencies	$	72,539	$	9	$	—		$	72,548
Commercial paper		30,345		1		—			30,346
Corporate bonds		22,763		34		—			22,797
	$	125,647	$	44	$	—		$	125,691
Available-for-sale securities (non-current):
Government agencies		10,499		9		—			10,508
	$	10,499	$	9	$	—		$	10,508
March 31, 2012			Unrealized
	Cost		Gain		Loss			Fair Value
Available-for-sale securities (current):
Commercial paper	$	83,645	$	—	$	—		$	83,645
Government agencies		46,293		5		—			46,298
Corporate Bonds		17,987		51		—			18,038
	$	147,925	$	56	$	—		$	147,981
Available-for-sale securities (non-current):
Government agencies	$	20,989	$	—	$	(26	)	$	20,963
Corporate Bonds		2,070		13		—			2,083
	$	23,059	$	13	$	(26	)	$	23,046