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Summary of Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 31, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Net sales | $ 883,748 |  | $ 854,261 | $ 876,569 | $ 852,229 | $ 925,097 | $ 742,986 | $ 730,433 | $ 738,204 |  | $ 3,466,807 | $ 3,136,720 | $ 2,876,748
Gross profit on sales | 233,945 |  | 222,839 | 239,879 | 229,796 | 258,241 | 204,864 | 201,938 | 207,112 |  | 926,459 | 872,155 | 786,732
Gain on bargain purchase |  |  |  |  |  | 23,879 |  |  |  |  | 0 | 23,879 | 0
Net income | $ 63,654 | [1] | $ 4,449 | $ 18,475 | $ 11,836 | $ 41,140 | $ 10,628 | $ 15,265 | $ 20,129 |  | $ 98,414 | $ 87,162 | $ 59,330
Basic and diluted earnings per share | $ 2.37 |  | $ 0.16 | $ 0.69 | $ 0.44 | $ 1.52 | $ 0.40 | $ 0.57 | $ 0.75 |  | $ 3.66 | $ 3.24 | $ 2.21
2017 tax reform |  |  |  |  |  |  |  |  |  |  | $ (49,336) |  |
Federal tax rate |  |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Scenario, Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Federal tax rate |  |  |  |  |  |  |  |  |  | 21.00% |  |  |
[1] | The quarter ended December 30, 2017 includes the tax benefit of $49.3 million as a result of revaluing the Company's net deferred tax liability using the enacted Federal tax rate of 21% under the Tax Reform.

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