Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Nov. 30, 2012

A summary of our cash, cash equivalents and available-for-sale investments at November 30, 2012 is as follows (in thousands):



	Amortized Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Cash	$	176,201	$	—	$	—		$	176,201
Money market funds	125,591		—		—			125,591
State and municipal bond obligations	50,565		255		(2		)	50,818
Auction rate securities – municipal bonds	27,175		—		(3,755		)	23,420
Auction rate securities – student loans	3,500		—		(599		)	2,901
Corporate bonds	2,608		—		(1		)	2,607
Total	$	385,640	$	255	$	(4,357	)	$	381,538

A summary of our cash, cash equivalents and trading and available-for-sale investments at November 30, 2011 is as follows (in thousands):



	Amortized Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Cash	$	134,890	$	—	$	—		$	134,890
Money market funds	24,220		—		—			24,220
State and municipal bond obligations	84,193		221		(16		)	84,398
Brazilian mutual funds	15,346		—		—			15,346
Auction rate securities – municipal bonds	27,200		—		(4,269		)	22,931
Auction rate securities – student loans	12,700		—		(2,092		)	10,608
Corporate bonds	2,562		—		—			2,562
Total	$	301,111	$	221	$	(6,377	)	$	294,955

Such amounts are classified on our consolidated balance sheets as follows (in thousands):



	November 30, 2012						November 30, 2011
	Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	176,201	$	—	$	—	$	134,890	$	—	$	—
Money market funds	125,591		—		—		24,220		—		—
State and municipal bond obligations	—		50,818		—		1,985		82,413		—
Brazilian mutual funds	—		—		—		—		15,346		—
Auction rate securities – municipal bonds	—		—		23,420		—		—		22,931
Auction rate securities – student loans	—		—		2,901		—		—		10,608
Corporate bonds	—		2,607		—		—		2,562		—
Total	$	301,792	$	53,425	$	26,321	$	161,095	$	100,321	$	33,539

The fair value of debt securities by contractual maturity is as follows (in thousands):


(1)	Includes ARS which are tendered for interest-rate setting purposes periodically throughout the year. Beginning in February 2008, auctions for these securities began to fail, and therefore these investments currently lack short-term liquidity. The remaining contractual maturities of these securities range from 11 to 30 years.

Investments with continuous unrealized losses and their related fair values are as follows at November 30, 2012 (in thousands):



	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
State and municipal bond obligations	$	5,818	$	(1	)	$	472	$	(1	)	$	6,290	$	(2	)
Auction rate securities – municipal bonds	—		—			23,420		(3,755		)	23,420		(3,755		)
Auction rate securities – student loans	—		—			2,901		(599		)	2,901		(599		)
Corporate bonds	2,607		(1		)	—		—			2,607		(1		)
Total	$	8,425	$	(2	)	$	26,793	$	(4,355	)	$	35,218	$	(4,357	)

Investments with continuous unrealized losses and their related fair values are as follows at November 30, 2011 (in thousands):



	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
State and municipal bond obligations	$	24,585	$	(16	)	$	—	$	—		$	24,585	$	(16	)
Auction rate securities – municipal bonds	—		—			22,931		(4,269		)	22,931		(4,269		)
Auction rate securities – student loans	—		—			10,608		(2,092		)	10,608		(2,092		)
Total	$	24,585	$	(16	)	$	33,539	$	(6,361	)	$	58,124	$	(6,377	)