Financial Instruments

We invest our excess cash in a variety of marketable securities, which are all classified as available-for-sale. The following summarizes our cash and cash equivalents, restricted cash and cash equivalents and marketable securities by significant financial instrument category as of the respective periods:



	February 28, 2015
($ in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents⁽¹⁾		Current Marketable Securities		Noncurrent Marketable Securities
Cash	$	657,122	$	—	$	—		$	657,122	$	657,122	$	—	$	—
Level 1:
Money market funds	108,666		—		—			108,666		108,666		—		—
Level 2:
Corporate bonds	128,979		62		(180		)	128,861		—		80,069		48,792
Tax-exempt municipal bonds	76,244		79		(199		)	76,124		202		63,479		12,443
Time deposits	50,180		—		—			50,180		25,075		25,105		—
Other	39,001		8		(56		)	38,953		—		25,092		13,861
Total	$	1,060,192	$	149	$	(435	)	$	1,059,906	$	791,065	$	193,745	$	75,096



	August 31, 2014
($ in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents⁽¹⁾		Current Marketable Securities		Noncurrent Marketable Securities
Cash	$	1,295,395	$	—	$	—		$	1,295,395	$	1,295,395	$	—	$	—
Level 1:
Money market funds	132,508		—		—			132,508		132,508		—		—
Level 2:
Tax-exempt municipal bonds	106,543		155		(11		)	106,687		—		78,443		28,244
Corporate bonds	106,575		123		(52		)	106,646		—		56,837		49,809
Time deposits	50,100		—		—			50,100		25,041		25,059		—
Commercial paper	11,793		1		—			11,794		—		11,794		—
Other	19,155		1		(1		)	19,155		4		15,339		3,812
Level 3:
Auction-rate securities⁽²⁾	6,850		—		(904		)	5,946		—		—		5,946
Total	$	1,728,919	$	280	$	(968	)	$	1,728,231	$	1,452,948	$	187,472	$	87,811

⁽¹⁾ Cash and cash equivalents includes restricted cash and cash equivalents.

⁽²⁾ Auction-rate securities were redeemed at par value during the second quarter of fiscal year 2015.

We measure our financial instruments at fair value on a recurring basis as follows:


•	Money market funds - We use Level 1 inputs that primarily consist of real-time quotes for transactions in active exchange markets involving identical assets.


•	Other financial instruments - We use a market approach with Level 2 observable inputs for all other securities. The Level 2 inputs include quoted prices for similar assets in active markets, or quoted prices for identical or similar assets in markets that are not active.

Our marketable securities have maturities that occur within three years. We may sell certain of our available-for-sale securities prior to their stated maturities for strategic reasons including, but not limited to, investment yield and credit risk management. We have not recognized significant gains or losses related to such sales.