CASH, CASH EQUIVALENTS, AND INVESTMENTS

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, 2014 and March 31, 2014 (in thousands):



September 30, 2014	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	$	263,730	$	—	$	—		$	263,730	$	263,730	$	—	$	—
Level 1:
Mutual Funds	3,998		104		(21		)	4,081		—		4,081		—
Level 2:
Government Agency Securities	73,093		54		(19		)	73,128		—		18,477		54,651
Commercial Paper	32,581		4		(1		)	32,584		4,499		28,085		—
Corporate Bonds	96,502		231		(17		)	96,716		—		39,647		57,069
Subtotal	202,176		289		(37		)	202,428		4,499		86,209		111,720

Total cash, cash equivalents and investments measured at fair value	$	469,904	$	393	$	(58	)	$	470,239	$	268,229	$	90,290	$	111,720



March 31, 2014	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	$	232,704	$	—	$	—		$	232,704	$	232,704	$	—	$	—
Level 1:
Mutual Funds	1,779		31		(3		)	1,807		—		1,807		—
Level 2:
Government Agency Securities	53,976		43		(9		)	54,010		—		21,325		32,685
Commercial Paper	47,766		7		—			47,773		—		47,773		—
Corporate Bonds	98,289		195		(17		)	98,467		—		30,810		67,657
CDs	1,002		—		—			1,002		—		1,002		—
Subtotal	201,033		245		(26		)	201,252		—		100,910		100,342

Total cash, cash equivalents and investments measured at fair value	$	435,516	$	276	$	(29	)	$	435,763	$	232,704	$	102,717	$	100,342

As of September 30, 2014 and March 31, 2014, all of the Company's investments are classified as available-for-sale securities. The carrying value of available-for-sale securities included in cash equivalents approximates fair value because of the short maturity of those instruments.

The Company did not incur any material realized or unrealized gains or losses in the three and six months ended September 30, 2014 and 2013.

There were no transfers between fair value measurement levels during the three and six months ended September 30, 2014 and 2013.

All financial assets and liabilities are recognized or disclosed at fair value in the financial statements. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1

The Company's Level 1 financial assets consist of Mutual Funds. The fair value of Level 1 financial instruments is measured based on the quoted market price of identical securities.

Level 2

The Company's Level 2 financial assets and liabilities consist of Government Agency Securities, Commercial Paper, Corporate Bonds, and derivative foreign currency contracts. The fair value of Level 2 investment securities is determined based on other observable inputs, including multiple non-binding quotes from independent pricing services. Non-binding quotes are based on proprietary valuation models that are prepared by the independent pricing services and use algorithms based on inputs such as observable market data, quoted market prices for similar securities, issuer spreads, and internal assumptions of the broker. The Company corroborates the reasonableness of non-binding quotes received from the independent pricing services using a variety of techniques depending on the underlying instrument, including: (i) comparing them to actual experience gained from the purchases and maturities of investment securities, (ii) comparing them to internally developed cash flow models based on observable inputs, and (iii) monitoring changes in ratings of similar securities and the related impact on fair value. The fair value of Level 2 derivative foreign currency contracts is determined using pricing models that use observable market inputs. For more information regarding the Company's derivative assets and liabilities, refer to Note 10, Foreign Currency Derivatives, of the accompanying notes to condensed consolidated financial statements (unaudited) in this Quarterly Report on Form 10-Q.