Investments

12 Months Ended

Nov. 30, 2013

Investments [Abstract]

Investments

Investments

Short-term investments, which are classified as available-for-sale, are summarized below as of November 30, 2013 and 2012 (in thousands):

	Purchased/Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Aggregate Fair Value
As of November 30, 2013
Money market funds	$	245,953	$	—	$	—		$	245,953
Corporate bonds and commercial paper	77,442		66		—			77,508
U.S Government debt and agency securities	6,012		1		—			6,013
Term deposits	536		—		—			536
Mortgage-backed securities	200		121		—			321
	$	330,143	$	188	$	—		$	330,331
As of November 30, 2012
Money market funds	$	376,480	$	—	$	—		$	376,480
Corporate bonds and commercial paper	24,558		9		(9		)	24,558
U.S Government debt and agency securities	9,646		—		(1		)	9,645
Term deposits	595		—		—			595
Mortgage-backed securities	182		78		(52		)	208
	$	411,461	$	87	$	(62	)	$	411,486

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

	November 30,
	2013		2012
Contractual maturities:
Less than one year	$	36,084	$	22,733
One to three years	47,758		11,678
	$	83,842	$	34,411

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.