The following tables summarize the Company’s cash and available-for-sale securities’ adjusted cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category recorded as cash and cash equivalents, short-term, or long-term investments as of September 30, 2015 and March 31, 2015 (in thousands):



September 30, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash & Cash Equivalents		Short-term investments (due in 1 year or less)		Long-term investments (due in 1 to 3 years)
Cash	$	299,808	$	—	$	—		$	299,808	$	299,808	$	—	$	—
Level 1:
Mutual Funds	8,543		—		(484		)	8,059		—		8,059		—
Money Market Funds	29		—		—			29		29		—		—
Subtotal	8,572		—		(484		)	8,088		29		8,059		—
Level 2:
Government Agency Securities	78,315		46		(6		)	78,355		—		42,449		35,906
Commercial Paper	23,759		11		(1		)	23,769		4,999		18,770		—
Corporate Bonds	95,593		83		(121		)	95,555		—		50,329		45,226
Subtotal	197,667		140		(128		)	197,679		4,999		111,548		81,132

Total cash, cash equivalents and investments measured at fair value	$	506,047	$	140	$	(612	)	$	505,575	$	304,836	$	119,607	$	81,132



March 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash & Cash Equivalents		Short-term investments (due in 1 year or less)		Long-term investments (due in 1 to 3 years)
Cash	$	273,350	$	—	$	—		$	273,350	$	273,350	$	—	$	—
Level 1:
Mutual Funds	5,398		147		(25		)	5,520		—		5,520		—
Level 2:
Government Agency Securities	89,875		37		(22		)	89,890		—		43,024		46,866
Commercial Paper	17,574		10		—			17,584		3,500		14,084		—
Corporate Bonds	95,759		199		(3		)	95,955		—		35,231		60,724
Subtotal	203,208		246		(25		)	203,429		3,500		92,339		107,590

Total cash, cash equivalents and investments measured at fair value	$	481,956	$	393	$	(50	)	$	482,299	$	276,850	$	97,859	$	107,590