Summary of Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Summary of Quarterly Results [Abstract]
Net sales	$ 1,025,690	$ 1,002,387	$ 1,098,704	$ 985,820	$ 902,392	$ 876,222	$ 887,967	$ 876,718	$ 4,112,601	$ 3,543,299	$ 3,509,270
Gross profit on sales	269,066	274,333	292,888	264,147	239,147	232,825	236,670	229,552	1,100,434	938,194	935,001
Net income	$ 19,420	$ 31,336	$ 41,472	$ 26,689	$ 18,885	$ 14,319	$ 20,475	$ 14,304	$ 118,917	$ 67,983	$ 62,738
Basic and diluted earnings per share	$ 0.73	$ 1.16	$ 1.54	$ 0.99	$ 0.70	$ 0.53	$ 0.76	$ 0.53	$ 4.42	$ 2.53	$ 2.33

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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