Summary of Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Summary of Quarterly Results [Abstract]
Net sales	$ 902,392	$ 876,222	$ 887,967	$ 876,718	$ 892,988	$ 869,076	$ 871,100	$ 876,106	$ 3,543,299	$ 3,509,270	$ 3,466,807
Gross profit on sales	239,147	232,825	236,670	229,552	227,459	232,340	240,295	234,907	938,194	935,001	912,523
Net income	$ 18,885	$ 14,319	$ 20,475	$ 14,304	$ 13,245	$ 14,207	$ 19,095	$ 16,191	$ 67,983	$ 62,738	$ 98,414
Basic and diluted earnings per share	$ 0.70	$ 0.53	$ 0.76	$ 0.53	$ 0.49	$ 0.53	$ 0.71	$ 0.60	$ 2.53	$ 2.33	$ 3.66

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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