Fair Value Measurements (Tables)

3 Months Ended

Jun. 30, 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 June 30, 2012 and March 31, 2012 was as follows (in thousands):

June 30, 2012	Level 1		Level 2			Level 3		Total
Money market securities	$	5,268	$	—		$	—	$	5,268
Government agencies		—		75,159			—		75,159
Commercial paper		—		60,589			—		60,589
Corporate Bonds		—		19,857			—		19,857
Municipal bonds		—		5,141			—		5,141
Forward purchase or (sale) contracts:
Japanese Yen		—		45			—		45
Taiwan Dollar		—		(1	)		—		(1	)
Korean Won		—		(102	)		—		(102	)
Euro		—		(14	)		—		(14	)
British Pound		—		69			—		69
Chinese Renminbi		—		(36	)		—		(36	)
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 June 30, 2012, and March 31, 2012 was as follows (in thousands):

June 30, 2012			Unrealized
	Cost		Gain		Loss			Fair Value
Available-for-sale securities (current):
Government agencies	$	62,167	$	—	$	(2	)	$	62,165
Commercial paper		60,589		—		—			60,589
Corporate Bonds		19,812		45		—			19,857
Municipal bonds		5,141		—		—			5,141
	$	147,709	$	45	$	(2	)	$	147,752
Available-for-sale securities (non-current):
Government agencies	$	12,991	$	3	$	—		$	12,994
	$	12,991	$	3	$	—		$	12,994
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