Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Statement Of Income And Comprehensive Income [Abstract]
NET SALES	$ 5,822,521	$ 5,788,425
COST OF GOODS SOLD	4,830,594	4,797,117
Gross profit	991,927	991,308
OPERATING EXPENSES:
Distribution, selling and administrative costs	887,881	913,591
Restructuring charges	1,552	1,873
Total operating expenses	889,433	915,464
OPERATING INCOME	102,494	75,844
OTHER INCOME—Net	(3,130)	(680)
INTEREST EXPENSE—Net	42,844	41,886
Income before income taxes	62,780	34,638
INCOME TAX (BENEFIT) PROVISION	(4,537)	7,822
NET INCOME	67,317	26,816
OTHER COMPREHENSIVE INCOME—Net of tax:
Changes in retirement benefit obligations	603	657
Unrecognized gain on interest rate swaps	9,040
COMPREHENSIVE INCOME	$ 76,960	$ 27,473
NET INCOME PER SHARE
Basic	$ 0.31	$ 0.12
Diluted	$ 0.31	$ 0.12
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING
Basic	215,080,238	221,364,013
Diluted	217,212,222	226,323,410