Summary of Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Summary of Quarterly Results [Abstract]
Net sales	$ 686,392	$ 661,412	$ 662,072	$ 682,712	$ 694,307	$ 668,391	$ 677,097	$ 661,610	$ 2,692,588	$ 2,701,405	$ 2,752,504
Gross profit on sales	181,256	182,763	190,322	191,127	190,553	181,276	187,599	183,125	745,468	742,553	735,855
Net income	$ 15,721	$ 11,692	$ 24,179	$ 20,129	$ 22,103	$ 17,178	$ 23,204	$ 20,026	$ 71,721	$ 82,511	$ 75,584
Basic and diluted earnings per share	$ 0.59	$ 0.43	$ 0.90	$ 0.75	$ 0.83	$ 0.64	$ 0.86	$ 0.74	$ 2.67	$ 3.07	$ 2.81