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Investments (Tables)
 12 Months Ended
Nov. 30, 2012
Investments [Abstract]  
Summary Of Marketable Securities Classified As Available-For-Sale
, 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
Summary Of Contractual Maturities Of Fixed Income Securities Included In Short-Term Investments
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