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Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Dec. 31, 2016	Oct. 08, 2016	Jul. 16, 2016	Jan. 02, 2016	Oct. 10, 2015	Jul. 18, 2015	Apr. 23, 2016	Apr. 25, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 868,717	$ 918,791	$ 935,025	$ 858,363	$ 885,302	$ 888,795	$ 1,204,352	$ 1,146,045	$ 3,926,885	$ 3,778,505	$ 3,748,973
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)	450,462	476,760	477,955	455,939	464,045	457,253	621,190	585,916	2,026,367	1,963,153	1,950,633
Net income	$ 13,042	$ 40,216	$ 51,155	$ 32,246	$ 43,796	$ 51,760	$ 59,363	$ 61,389	$ 163,776	$ 189,191	$ 175,739
Basic earnings per common share	$ 0.06	$ 0.19	$ 0.25	$ 0.15	$ 0.21	$ 0.25	$ 0.28	$ 0.29	$ 0.79	$ 0.90	$ 0.84
Diluted earnings per common share	$ 0.06	$ 0.19	$ 0.24	$ 0.15	$ 0.21	$ 0.24	$ 0.28	$ 0.29	$ 0.78	$ 0.89	$ 0.82

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The aggregate cost of goods produced and sold during the reporting period, excluding depreciation, depletion, and amortization.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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