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Net Income per Share - Share Repurchase Programs (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | May 03, 2017 | Mar. 21, 2016
Share Repurchase Program |  |  |  |  |  |
Share repurchase program, amount authorized to be repurchased |  |  |  |  | $ 20.0 | $ 20.0
Number of shares repurchased and retired | 165,629 | 110,908 | 554,708 | 783,703 |  |
Average repurchase price per share (in dollars per share) | $ 36.63 | $ 25.84 | $ 35.23 | $ 24.33 |  |
Amount available for future repurchases | $ 9.5 |  | $ 9.5 |  |  |

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