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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Net Income Per Share | Net income per share is calculated as follows (in thousands, except per share amounts):
| Fiscal three months ended |  | Fiscal three months ended
| June 30, 2018 |  | July 1, 2017
| Income |  | Shares |  | Per Share Amount |  | Income |  | Shares |  | Per Share Amount
Basic net income per share: | $ | 207,289 |  |  | 122,100 |  |  | $ | 1.70 |  |  | $ | 160,649 |  |  | 128,186 |  |  | $ | 1.25 |
Dilutive effect of share-based awards | — |  |  | 675 |  |  | (0.01 | ) |  | — |  |  | 536 |  |  | — |
Diluted net income per share: | $ | 207,289 |  |  | 122,775 |  |  | $ | 1.69 |  |  | $ | 160,649 |  |  | 128,722 |  |  | $ | 1.25 |
| Fiscal six months ended |  | Fiscal six months ended
| June 30, 2018 |  | July 1, 2017
| Income |  | Shares |  | Per Share Amount |  | Income |  | Shares |  | Per Share Amount
Basic net income per share: | $ | 278,722 |  |  | 123,288 |  |  | $ | 2.26 |  |  | $ | 220,960 |  |  | 129,231 |  |  | $ | 1.71 |
Dilutive effect of share-based awards | — |  |  | 687 |  |  | (0.01 | ) |  | — |  |  | 675 |  |  | (0.01 | )
Diluted net income per share: | $ | 278,722 |  |  | 123,975 |  |  | $ | 2.25 |  |  | $ | 220,960 |  |  | 129,906 |  |  | $ | 1.70 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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