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Summary of Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 27, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Summary of Quarterly Results [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 713,788 us-gaap_SalesRevenueGoodsNet | $ 683,893 us-gaap_SalesRevenueGoodsNet | $ 691,875 us-gaap_SalesRevenueGoodsNet | $ 687,127 us-gaap_SalesRevenueGoodsNet | $ 686,392 us-gaap_SalesRevenueGoodsNet | $ 661,412 us-gaap_SalesRevenueGoodsNet | $ 662,072 us-gaap_SalesRevenueGoodsNet | $ 682,712 us-gaap_SalesRevenueGoodsNet | $ 2,776,683 us-gaap_SalesRevenueGoodsNet | $ 2,692,588 us-gaap_SalesRevenueGoodsNet | $ 2,701,405 us-gaap_SalesRevenueGoodsNet
Gross profit on sales | 192,793 us-gaap_GrossProfit | 185,677 us-gaap_GrossProfit | 187,724 us-gaap_GrossProfit | 186,768 us-gaap_GrossProfit | 181,256 us-gaap_GrossProfit | 182,763 us-gaap_GrossProfit | 190,322 us-gaap_GrossProfit | 191,127 us-gaap_GrossProfit | 752,962 us-gaap_GrossProfit | 745,468 us-gaap_GrossProfit | 742,553 us-gaap_GrossProfit
Net income | $ 13,896 us-gaap_NetIncomeLoss | $ 13,707 us-gaap_NetIncomeLoss | $ 12,798 us-gaap_NetIncomeLoss | $ 14,766 us-gaap_NetIncomeLoss | $ 15,721 us-gaap_NetIncomeLoss | $ 11,692 us-gaap_NetIncomeLoss | $ 24,179 us-gaap_NetIncomeLoss | $ 20,129 us-gaap_NetIncomeLoss | $ 55,167 us-gaap_NetIncomeLoss | $ 71,721 us-gaap_NetIncomeLoss | $ 82,511 us-gaap_NetIncomeLoss
Basic and diluted earnings per share | $ 0.51 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.51 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.48 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.55 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.59 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.43 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.90 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.75 us-gaap_EarningsPerShareBasicAndDiluted | $ 2.05 us-gaap_EarningsPerShareBasicAndDiluted | $ 2.67 us-gaap_EarningsPerShareBasicAndDiluted | $ 3.07 us-gaap_EarningsPerShareBasicAndDiluted

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- Definition 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. + References No definition available. + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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