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Cash, Cash Equivalents and Short-Term Investments (Tables)
12 Months Ended
Nov. 27, 2015
Nov. 28, 2014
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 November 27, 2015 (in thousands):
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Estimated
Fair Value
Current assets:
 
 
 
 
 
 
 
Cash
$
352,371

 
$

 
$

 
$
352,371

Cash equivalents:
 
 
 
 
 
 
 
Money market mutual funds
482,479

 

 

 
482,479

Municipal securities
1,850

 

 
(1
)
 
1,849

Time deposits
13,461

 

 

 
13,461

U.S. Treasury securities
26,400

 

 

 
26,400

Total cash equivalents
524,190

 

 
(1
)
 
524,189

Total cash and cash equivalents
876,561

 

 
(1
)
 
876,560

Short-term fixed income securities:
 
 
 
 
 
 
 
Corporate bonds and commercial paper
1,890,253

 
2,273

 
(5,612
)
 
1,886,914

Asset-backed securities
83,449

 
11

 
(146
)
 
83,314

Foreign government securities
1,276

 

 
(8
)
 
1,268

Municipal securities
137,280

 
101

 
(49
)
 
137,332

U.S. agency securities
130,397

 
85

 
(14
)
 
130,468

U.S. Treasury securities
873,400

 
101

 
(1,273
)
 
872,228

Total short-term investments
3,116,055

 
2,571

 
(7,102
)
 
3,111,524

Total cash, cash equivalents and short-term investments
$
3,992,616

 
$
2,571

 
$
(7,103
)
 
$
3,988,084


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 November 27, 2015 and November 28, 2014 (in thousands):
 
2015
 
2014
 
Fair 
Value
 
Gross
Unrealized
Losses
 
Fair 
Value
 
Gross
Unrealized
Losses
Corporate bonds and commercial paper
$
1,112,883

 
$
(5,377
)
 
$
291,890

 
$
(443
)
Asset-backed securities
60,057

 
(147
)
 

 

Municipal securities
35,594

 
(50
)
 
21,759

 
(12
)
Foreign government securities
1,268

 
(8
)
 

 

U.S. Treasury and agency securities
820,570

 
(1,287
)
 
43,507

 
(64
)
Total
$
2,030,372

 
$
(6,869
)
 
$
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 November 27, 2015 and November 28, 2014 (in thousands):
 
2015
 
2014
 
Fair 
Value
 
Gross
Unrealized
Losses
 
Fair 
Value
 
Gross
Unrealized
Losses
Corporate bonds and commercial paper
$
30,218

 
$
(233
)
 
$
8,636

 
$
(66
)
Municipal securities
1,300

 
(1
)
 

 

U.S. Treasury and agency securities

 

 
5,884

 
(28
)
Total
$
31,518

 
$
(234
)
 
$
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 November 27, 2015 (in thousands):
 
Amortized
Cost
 
Estimated
Fair Value
Due within one year
$
853,041

 
$
853,007

Due between one and two years
1,205,254

 
1,202,586

Due between two and three years
773,150

 
771,332

Due after three years
284,610

 
284,599

Total
$
3,116,055

 
$
3,111,524