Investments

12 Months Ended

Nov. 30, 2011

Investments [Abstract]

Investments

4.    Investments

Marketable securities, which are classified as available-for-sale, are summarized below as of November 30, 2011 and 2010 (in thousands):

	Purchased/ Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Aggregate Fair Value
As of November 30, 2011:
Money market funds	$	16,664	$	—	$	—		$	16,664
Term deposits		560		—		—			560
Mortgage-backed securities		200		51		(26	)		225
	$	17,424	$	51	$	(26	)	$	17,449
As of November 30, 2010:
Money market funds	$	37,016	$	—	$	—		$	37,016
Term deposits		8,707		—		—			8,707
Mortgage-backed securities		201		—		(10	)		191
	$	45,924	$	—	$	(10	)	$	45,914

Fixed income securities included in short-term investments above, are summarized by their contractual maturities as follows (in thousands):

	November 30,
	2011		2010
Contractual maturities:
Less than one year	$	—	$	1,313
One to three years		225		191
	$	225	$	1,504

The maturities of mortgage-backed securities were primarily based upon payment forecasts utilizing interest rate scenarios and mortgage loan characteristics. Realized and unrealized gains and losses on our investments were primarily due to changes in interest rates and market and credit conditions of the underlying securities and were insignificant for any period presented.