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Cash, Cash Equivalents and Short-Term Investments (Tables)
 9 Months Ended
Sep. 01, 2017
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 September 1, 2017 (in thousands):
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Estimated
Fair Value
Current assets:
 
 
 
 
 
 
 
Cash
$
413,411

 
$
—

 
$
—

 
$
413,411

Cash equivalents:
 
 
 
 
 
 
 
Money market mutual funds
1,344,350

 
—

 
—

 
1,344,350

Time deposits
16,789

 
—

 
—

 
16,789

Total cash equivalents
1,361,139

 
—

 
—

 
1,361,139

Total cash and cash equivalents
1,774,550

 
—

 
—

 
1,774,550

Short-term fixed income securities:
 
 
 
 
 
 
 
Asset-backed securities
99,295

 
51

 
(162
)
 
99,184

Corporate bonds and commercial paper
2,427,062

 
8,962

 
(3,000
)
 
2,433,024

Municipal securities
145,850

 
162

 
(51
)
 
145,961

U.S. Treasury securities
917,426

 
14

 
(1,673
)
 
915,767

Total short-term investments
3,589,633

 
9,189

 
(4,886
)
 
3,593,936

Total cash, cash equivalents and short-term investments
$
5,364,183

 
$
9,189

 
$
(4,886
)
 
$
5,368,486


Cash, cash equivalents and short-term investments consisted of the following as of December 2, 2016 (in thousands):
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Estimated
Fair Value
Current assets:
 
 
 
 
 
 
 
Cash
$
208,635

 
$
—

 
$
—

 
$
208,635

Cash equivalents:
 

 
 
 
 
 
 

Corporate bonds and commercial paper
1,249

 
—

 
—

 
1,249

Money market mutual funds
782,210

 
—

 
—

 
782,210

Municipal securities
1,301

 
—

 
—

 
1,301

Time deposits
17,920

 
—

 
—

 
17,920

Total cash equivalents
802,680

 
—

 
—

 
802,680

Total cash and cash equivalents
1,011,315

 
—

 
—

 
1,011,315

Short-term fixed income securities:
 
 
 
 
 
 
 

Asset-backed securities
111,009

 
95

 
(190
)
 
110,914

Corporate bonds and commercial paper
2,464,769

 
3,135

 
(9,554
)
 
2,458,350

Municipal securities
134,710

 
37

 
(525
)
 
134,222

U.S. agency securities
39,538

 
42

 
—

 
39,580

U.S. Treasury securities
1,008,195

 
194

 
(1,470
)
 
1,006,919

Total short-term investments
3,758,221

 
3,503

 
(11,739
)
 
3,749,985

Total cash, cash equivalents and short-term investments
$
4,769,536

 
$
3,503

 
$
(11,739
)
 
$
4,761,300
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 September 1, 2017 and December 2, 2016 (in thousands):
 
2017
 
2016
 
Fair 
Value
 
Gross
Unrealized
Losses
 
Fair 
Value
 
Gross
Unrealized
Losses
Corporate bonds and commercial paper
$
710,735

 
$
(2,497
)
 
$
1,282,076

 
$
(9,474
)
Asset-backed securities
62,235

 
(150
)
 
54,063

 
(189
)
Municipal securities
6,387

 
(23
)
 
114,810

 
(525
)
U.S. Treasury and agency securities
808,221

 
(1,400
)
 
580,529

 
(1,470
)
Total
$
1,587,578

 
$
(4,070
)
 
$
2,031,478

 
$
(11,658
)
 
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 September 1, 2017 and December 2, 2016 (in thousands):
 
2017
 
2016
 
Fair 
Value
 
Gross
Unrealized
Losses
 
Fair 
Value
 
Gross
Unrealized
Losses
Corporate bonds and commercial paper
$
94,397

 
$
(503
)
 
$
39,162

 
$
(80
)
Asset-backed securities
1,495

 
(12
)
 
1,331

 
(1
)
Municipal securities
10,077

 
(28
)
 
—

 
—

U.S. Treasury and agency securities
47,636

 
(273
)
 
—

 
—

Total
$
153,605

 
$
(816
)
 
$
40,493

 
$
(81
)
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 September 1, 2017 (in thousands):
 
Amortized
Cost
 
Estimated
Fair Value
Due within one year
$
1,079,772

 
$
1,079,092

Due between one and two years
1,353,653

 
1,353,378

Due between two and three years
776,048

 
778,726

Due after three years
380,160

 
382,740

Total
$
3,589,633

 
$
3,593,936