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INVESTMENTS (Tables)
 3 Months Ended
Feb. 28, 2013
Investments [Abstract]  
Summary of Marketable Securities which are Classified as Available-for-Sale
Short-term investments, which are classified as available-for-sale, are summarized below as of February 28, 2013 and November 30, 2012 (in thousands):
 
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Aggregate
Fair Value
As of February 28, 2013
 
 
 
 
 
 
 
 
Money market funds
 
$
388,320

 
$
—

 
$
—

 
$
388,320

Corporate bonds and commercial paper
 
24,429

 
18

 
(5
)
 
24,442

U.S. Government debt and agency securities
 
9,565

 
2

 
—

 
9,567

Term deposits
 
587

 
—

 
—

 
587

Mortgage-backed securities
 
202

 
79

 
(52
)
 
229

 
 
$
423,103

 
$
99

 
$
(57
)
 
$
423,145

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