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Revenue Recognition - Impact on Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenue | $ 232,221 | $ 266,042 | $ 613,052 | $ 583,161
Cost of revenue | 58,860 | 68,061 | 153,227 | 142,757
Gross margin | 173,361 | 197,981 | 459,825 | 440,404
Operating income | 77,844 | 110,849 | 175,895 | 208,086
Income before income tax expense | 81,273 | 112,752 | 185,825 | 213,793
Income tax expense (benefit) | 837 | 10,259 | 11,976 | 9,334
Net income | $ 80,436 | $ 102,493 | $ 173,849 | $ 204,459
Basic (usd per share) | $ 0.47 | $ 0.59 | $ 1.01 | $ 1.18
Diluted (usd per share) | $ 0.45 | $ 0.57 | $ 0.98 | $ 1.14
As previously reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenue |  | $ 259,739 |  | $ 567,585
Cost of revenue |  | 62,360 |  | 128,056
Gross margin |  | 197,379 |  | 439,529
Operating income |  | 110,247 |  | 207,211
Income before income tax expense |  | 112,150 |  | 212,918
Income tax expense (benefit) |  | 9,802 |  | 8,843
Net income |  | $ 102,348 |  | $ 204,075
Basic (usd per share) |  | $ 0.59 |  | $ 1.18
Diluted (usd per share) |  | $ 0.57 |  | $ 1.14
Accounting Standards Update 2014-09 | Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenue |  | $ 6,303 |  | $ 15,576
Cost of revenue |  | 5,701 |  | 14,701
Gross margin |  | 602 |  | 875
Operating income |  | 602 |  | 875
Income before income tax expense |  | 602 |  | 875
Income tax expense (benefit) |  | 457 |  | 491
Net income |  | $ 145 |  | $ 384
Basic (usd per share) |  | $ 0.00 |  | $ 0.00
Diluted (usd per share) |  | $ 0.00 |  | $ 0.00

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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