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Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												4 Months Ended				12 Months Ended
	Dec. 28, 2019		Oct. 05, 2019		Jul. 13, 2019		Dec. 29, 2018		Oct. 06, 2018		Jul. 14, 2018		Apr. 20, 2019		Apr. 21, 2018		Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 917,759		$ 966,561		$ 975,759		$ 880,667		$ 923,449		$ 941,283		$ 1,263,895		$ 1,206,453		$ 4,123,974	$ 3,951,852	$ 3,920,733
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)	485,960	[1]	509,056	[1]	508,552	[1]	467,155	[1]	485,680	[1]	488,871	[1]	652,141	[1]	625,122	[1]	2,155,709	2,066,828	2,009,473
Net income	$ 2,219		$ 43,358		$ 53,095		$ 20,841		$ 39,630		$ 45,442		$ 65,866		$ 51,247		$ 164,538	$ 157,160	$ 150,120
Basic net income per share	$ 0.01		$ 0.20		$ 0.25		$ 0.10		$ 0.19		$ 0.22		$ 0.31		$ 0.24		$ 0.78	$ 0.74	$ 0.72
Diluted net income per share	$ 0.01		$ 0.20		$ 0.25		$ 0.10		$ 0.19		$ 0.21		$ 0.31		$ 0.24		$ 0.78	$ 0.74	$ 0.71
[1] The company does not report gross margin.  This line item presents our material, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately) under an alternative presentation.

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Cost of product sold and service rendered, excluding depreciation, depletion, and amortization.

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