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Quarterly Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 4 Months Ended 12 Months Ended
Dec. 28, 2013
Oct. 05, 2013
Jul. 13, 2013
Dec. 29, 2012
Oct. 06, 2012
Jul. 14, 2012
Apr. 20, 2013
Apr. 21, 2012
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Schedule Of Quarterly Financial Information [Line Items]                      
Sales $ 843,550 $ 878,492 $ 898,153 $ 749,442 $ 717,282 $ 681,561 $ 1,130,810 $ 898,206 $ 3,751,005 $ 3,046,491 $ 2,773,356
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately) 447,511 467,798 471,614 390,666 382,508 365,658 585,298 478,978 1,972,221 1,617,810 1,473,201
Net income $ 38,520 [1] $ 33,888 $ 46,460 $ 38,567 $ 31,231 $ 28,380 $ 112,026 $ 37,943 $ 230,894 $ 136,121 $ 123,428
Basic net income per share $ 0.18 [1] $ 0.16 $ 0.22 $ 0.18 $ 0.15 $ 0.14 $ 0.54 $ 0.19 $ 1.11 $ 0.66 $ 0.61
Diluted net income per share $ 0.18 [1] $ 0.16 $ 0.22 $ 0.18 $ 0.15 $ 0.14 $ 0.53 $ 0.19 $ 1.09 $ 0.66 $ 0.60
[1] Includes an out-of-period adjustment of $4.4 million ($2.7 million, net of tax) described above.