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Cash, Cash Equivalents and Short-Term Investments (Tables)
 3 Months Ended
Mar. 01, 2013
Cash, Cash Equivalents, and Short Term Investments Disclosure [Abstract]  
Cash Cash Equivalents and Short term Investments
Cash, cash equivalents and short-term investments consisted of the following as of March 1, 2013 (in thousands):
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Estimated
Fair Value
Current assets:
 
 
 
 
 
 
 
Cash
$
247,671

 
$
—

 
$
—

 
$
247,671

Cash equivalents:
 
 
 
 
 
 
 
Corporate bonds and commercial paper
9,514

 
1

 
(2
)
 
9,513

Money market mutual funds
895,845

 
—

 
—

 
895,845

Municipal securities
1,498

 
—

 
(1
)
 
1,497

Time deposits
63,956

 
—

 
—

 
63,956

U.S. Treasury securities
87,900

 
1

 
(1
)
 
87,900

Total cash equivalents
1,058,713

 
2

 
(4
)
 
1,058,711

Total cash and cash equivalents
1,306,384

 
2

 
(4
)
 
1,306,382

Short-term fixed income securities:
 
 
 
 
 
 
 
Corporate bonds and commercial paper
1,195,722

 
10,379

 
(165
)
 
1,205,936

Foreign government securities
12,492

 
64

 
(1
)
 
12,555

Municipal securities
185,907

 
386

 
(11
)
 
186,282

U.S. agency securities
506,699

 
2,024

 
(20
)
 
508,703

U.S. Treasury securities
439,712

 
926

 
(1
)
 
440,637

Subtotal
2,340,532

 
13,779

 
(198
)
 
2,354,113

Marketable equity securities
194

 
—

 
—

 
194

Total short-term investments
2,340,726

 
13,779

 
(198
)
 
2,354,307

Total cash, cash equivalents and short-term investments
$
3,647,110

 
$
13,781

 
$
(202
)
 
$
3,660,689


Cash, cash equivalents and short-term investments consisted of the following as of November 30, 2012 (in thousands):
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Estimated
Fair Value
Current assets:
 
 
 
 
 
 
 
Cash
$
200,771

 
$
—

 
$
—

 
$
200,771

Cash equivalents:
 

 
 
 
 
 
 

Corporate bonds and commercial paper
3,998

 
—

 
—

 
3,998

Money market mutual funds and repurchase agreements
1,171,270

 
—

 
—

 
1,171,270

Municipal securities
3,895

 
—

 
—

 
3,895

Time deposits
45,118

 
—

 
—

 
45,118

Total cash equivalents
1,224,281

 
—

 
—

 
1,224,281

Total cash and cash equivalents
1,425,052

 
—

 
—

 
1,425,052

Short-term fixed income securities:
 
 
 
 
 
 
 

Corporate bonds and commercial paper
1,059,158

 
11,415

 
(133
)
 
1,070,440

Foreign government securities
6,919

 
45

 
(12
)
 
6,952

Municipal securities
180,488

 
97

 
(60
)
 
180,525

Time deposits
20,113

 
—

 
—

 
20,113

U.S. agency securities
501,863

 
2,346

 
(18
)
 
504,191

U.S. Treasury securities
330,072

 
801

 
(37
)
 
330,836

Subtotal
2,098,613

 
14,704

 
(260
)
 
2,113,057

Marketable equity securities
237

 
7

 
—

 
244

Total short-term investments
2,098,850

 
14,711

 
(260
)
 
2,113,301

Total cash, cash equivalents and short-term investments
$
3,523,902

 
$
14,711

 
$
(260
)
 
$
3,538,353
Continuous Unrealized Loss Position Less Than Twelve Months Related to Available-for-Sale Securities
The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category, that have been in an unrealized loss position for less than twelve months, as of March 1, 2013 and November 30, 2012 (in thousands):
 
2013
 
2012
 
Fair 
Value
 
Gross
Unrealized
Losses
 
Fair 
Value
 
Gross
Unrealized
Losses
Corporate bonds and commercial paper
$
191,986

 
$
(167
)
 
$
95,489

 
$
(132
)
Foreign government securities
3,599

 
(1
)
 
2,105

 
(12
)
Municipal securities
14,950

 
(12
)
 
40,524

 
(60
)
U.S. Treasury and agency securities
102,862

 
(19
)
 
48,203

 
(55
)
Total
$
313,397

 
$
(199
)
 
$
186,321

 
$
(259
)
 
Continuous Unrealized Loss Position Twelve Months or Longer Related to Available-for-Sale Securities
The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category, that have been in a continuous unrealized loss position for more than twelve months, as of March 1, 2013 and November 30, 2012 (in thousands):
 
2013
 
2012
 
Fair 
Value
 
Gross
Unrealized
Losses
 
Fair 
Value
 
Gross
Unrealized
Losses
Corporate bonds and commercial paper
$
—

 
$
—

 
$
2,999

 
$
(1
)
U.S. Treasury and agency securities
8,209

 
(3
)
 
—

 
—

Total
$
8,209

 
$
(3
)
 
$
2,999

 
$
(1
)
Cost and Estimated Fair Value of Debt Securities
The following table summarizes the cost and estimated fair value of short-term fixed income securities classified as short-term investments based on stated effective maturities as of March 1, 2013 (in thousands):
 
Amortized
Cost
 
Estimated
Fair Value
Due within one year
$
549,442

 
$
550,707

Due between one and two years
701,820

 
706,425

Due between two and three years
728,813

 
732,718

Due after three years
360,457

 
364,263

Total
$
2,340,532

 
$
2,354,113