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Net Income per Share - Share Repurchase Programs (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Feb. 15, 2018 | May 03, 2017
Share Repurchase Program |  |  |  |  |  |
Share repurchase program, amount authorized to be repurchased |  |  |  |  | $ 20.0 | $ 20.0
Number of shares repurchased and retired | 215,585 | 389,079 | 378,477 | 389,079 |  |
Average repurchase price per share (in dollars per share) | $ 55.99 | $ 34.63 | $ 53.90 | $ 34.63 |  |
Amount available for future repurchases | $ 9.1 |  | $ 9.1 |  |  |

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