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New accounting standards (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 02, 2017 | Jun. 26, 2016 | Jul. 02, 2017 | Jun. 26, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase in net income and cash flows from operating activities due to adoption of new standard |  |  | $ 197,690 | $ 181,488
Net income | $ 78,003 | $ 59,303 | $ 118,173 | $ 109,992
Net income (in dollars per share) | $ 1.67 | $ 1.26 | $ 2.53 | $ 2.29
Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income | $ 1,100 |  | $ 4,500 |
Net income (in dollars per share) | $ 0.02 |  | $ 0.09 |

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