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New accounting standards (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Apr. 02, 2017 | Mar. 27, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash (used in) provided by operating activities from continuing operations | $ 90,940 | $ 66,832
Net income | $ 40,170 | $ 50,689
Net income (in dollars per share) | $ 0.86 | $ 1.04
Accounting Standards Update 2016-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash (used in) provided by operating activities from continuing operations | $ 3,400 |
Net income | $ 3,400 |
Net income (in dollars per share) | $ 0.07 |

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