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Cash, Cash Equivalents and Short-Term Investments (Tables)
9 Months Ended
Aug. 28, 2015
Cash, Cash Equivalents, and Short-term Investments [Abstract]  
Cash Cash Equivalents and Short term Investments
Cash, cash equivalents and short-term investments consisted of the following as of August 28, 2015 (in thousands):
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Estimated
Fair Value
Current assets:
 
 
 
 
 
 
 
Cash
$
345,625

 
$

 
$

 
$
345,625

Cash equivalents:
 
 
 
 
 
 
 
Money market mutual funds
447,303

 

 

 
447,303

Time deposits
36,364

 

 

 
36,364

Total cash equivalents
483,667

 

 

 
483,667

Total cash and cash equivalents
829,292

 

 

 
829,292

Short-term fixed income securities:
 
 
 
 
 
 
 
Corporate bonds and commercial paper
1,732,496

 
1,596

 
(4,891
)
 
1,729,201

Asset-backed securities
67,307

 
40

 
(32
)
 
67,315

Municipal securities
164,449

 
221

 
(60
)
 
164,610

U.S. agency securities
207,550

 
182

 
(3
)
 
207,729

U.S. Treasury securities
670,367

 
363

 
(144
)
 
670,586

Total short-term investments
2,842,169

 
2,402

 
(5,130
)
 
2,839,441

Total cash, cash equivalents and short-term investments
$
3,671,461

 
$
2,402

 
$
(5,130
)
 
$
3,668,733


Cash, cash equivalents and short-term investments consisted of the following as of November 28, 2014 (in thousands):
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Estimated
Fair Value
Current assets:
 
 
 
 
 
 
 
Cash
$
348,283

 
$

 
$

 
$
348,283

Cash equivalents:
 

 
 
 
 
 
 

Money market mutual funds
705,978

 

 

 
705,978

Time deposits
63,139

 

 

 
63,139

Total cash equivalents
769,117

 

 

 
769,117

Total cash and cash equivalents
1,117,400

 

 

 
1,117,400

Short-term fixed income securities:
 
 
 
 
 
 
 

Corporate bonds and commercial paper
1,514,632

 
5,253

 
(509
)
 
1,519,376

Foreign government securities
4,499

 
12

 

 
4,511

Municipal securities
174,775

 
438

 
(12
)
 
175,201

U.S. agency securities
497,154

 
1,295

 
(64
)
 
498,385

U.S. Treasury securities
423,075

 
1,080

 
(28
)
 
424,127

Subtotal
2,614,135

 
8,078

 
(613
)
 
2,621,600

Marketable equity securities
153

 
338

 

 
491

Total short-term investments
2,614,288

 
8,416

 
(613
)
 
2,622,091

Total cash, cash equivalents and short-term investments
$
3,731,688

 
$
8,416

 
$
(613
)
 
$
3,739,491

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 August 28, 2015 and November 28, 2014 (in thousands):
 
2015
 
2014
 
Fair 
Value
 
Gross
Unrealized
Losses
 
Fair 
Value
 
Gross
Unrealized
Losses
Corporate bonds and commercial paper
$
1,213,183

 
$
(4,871
)
 
$
291,890

 
$
(443
)
Asset-backed securities
35,502

 
(32
)
 

 

Municipal securities
24,143

 
(60
)
 
21,759

 
(12
)
U.S. Treasury and agency securities
345,982

 
(144
)
 
43,507

 
(64
)
Total
$
1,618,810

 
$
(5,107
)
 
$
357,156

 
$
(519
)
 
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 were in a continuous unrealized loss position for more than twelve months, as of August 28, 2015 and November 28, 2014 (in thousands):
 
2015
 
2014
 
Fair 
Value
 
Gross
Unrealized
Losses
 
Fair 
Value
 
Gross
Unrealized
Losses
Corporate bonds and commercial paper
$
1,416

 
$
(20
)
 
$
8,636

 
$
(66
)
U.S. Treasury and agency securities
650

 
(3
)
 
5,884

 
(28
)
Total
$
2,066

 
$
(23
)
 
$
14,520

 
$
(94
)
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 August 28, 2015 (in thousands):
 
Amortized
Cost
 
Estimated
Fair Value
Due within one year
$
791,191

 
$
791,528

Due between one and two years
1,036,774

 
1,036,349

Due between two and three years
761,569

 
759,576

Due after three years
252,635

 
251,988

Total
$
2,842,169

 
$
2,839,441