Investments (Details) - USD ($)
$ in Thousands |
Oct. 01, 2016 |
Jan. 02, 2016 |
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
$ 511,929
|
$ 400,173
|
| Gross Unrealized Gains |
29
|
34
|
| Gross Unrealized Losses |
(404)
|
(674)
|
| Fair Value |
511,554
|
399,533
|
| Cash equivalents [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
120,077
|
132,502
|
| Fair Value |
120,077
|
132,502
|
| Cash equivalents [Member] | Money market funds [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
108,378
|
126,752
|
| Fair Value |
108,378
|
126,752
|
| Cash equivalents [Member] | Time deposits [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
9,199
|
5,677
|
| Fair Value |
9,199
|
5,677
|
| Cash equivalents [Member] | Commercial paper [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
2,500
|
|
| Fair Value |
2,500
|
|
| Cash equivalents [Member] | Government and corporate bonds [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
|
73
|
| Fair Value |
|
73
|
| Short-term investments [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
261,356
|
111,144
|
| Gross Unrealized Gains |
12
|
20
|
| Gross Unrealized Losses |
(183)
|
(105)
|
| Fair Value |
261,185
|
111,059
|
| Short-term investments [Member] | Time deposits [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
44,980
|
30,989
|
| Fair Value |
44,980
|
30,989
|
| Short-term investments [Member] | Commercial paper [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
37,825
|
1,500
|
| Gross Unrealized Losses |
(50)
|
(2)
|
| Fair Value |
37,775
|
1,498
|
| Short-term investments [Member] | Government and corporate bonds [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
178,551
|
78,655
|
| Gross Unrealized Gains |
12
|
20
|
| Gross Unrealized Losses |
(133)
|
(103)
|
| Fair Value |
178,430
|
78,572
|
| Long-term investments [Member] | Government and corporate bonds [Member] |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Adjusted Cost |
130,496
|
156,527
|
| Gross Unrealized Gains |
17
|
14
|
| Gross Unrealized Losses |
(221)
|
(569)
|
| Fair Value |
$ 130,292
|
$ 155,972
|