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Investments
 12 Months Ended
Nov. 30, 2012
Investments [Abstract]  
Investments
Investments
Short-term investments, which are classified as available-for-sale, are summarized below as of November 30, 2012 and 2011 (in thousands):
 
 
 
Purchased/Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Aggregate Fair Value
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

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


Fixed income securities included in short-term investments above are summarized by their contractual maturities as follows (in thousands):
 
 
 
November 30,
 
 
2012
 
2011
Contractual maturities:
 
 
 
 
Less than one year
 
$
22,733

 
$
—

One to three years
 
11,678

 
225

 
 
$
34,411

 
$
225


 
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.