Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 307,136	$ 187,825
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	250,449	294,685
Gain on disposal of property and equipment—net	(1,298)	(20)
Amortization and write-off of deferred financing costs	5,617	3,433
Deferred tax provision	49,560	31,581
Share-based compensation expense	20,457	15,060
Provision for doubtful accounts	13,210	12,901
Changes in operating assets and liabilities, net of business acquisitions:
Increase in receivables	(174,144)	(242,229)
Increase in inventories	(92,755)	(55,921)
Increase in prepaid expenses and other assets	(28,291)	(18,102)
Increase in accounts payable and bank checks outstanding	264,046	278,487
Decrease in accrued expenses and other liabilities	(169,967)	(1,268)
Net cash provided by operating activities	444,020	506,432
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of businesses—net of cash	(299)	(182,823)
Proceeds from sales of property and equipment	2,927	2,371
Purchases of property and equipment	(167,731)	(162,995)
Proceeds from redemption of industrial revenue bonds	0	22,139
Net cash used in investing activities	(165,103)	(321,308)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from debt borrowings	2,987,107	1,711,068
Principal payments on debt and capital leases	(3,321,661)	(1,848,732)
Redemption of industrial revenue bonds	0	(22,139)
Contingent consideration paid for business acquisitions	(1,592)	(6,375)
Payment for debt financing costs and fees	(816)	(1,256)
Proceeds from employee share purchase plan	14,918	12,077
Proceeds from exercise of stock options	18,328	14,904
Tax withholding payments for net share-settled equity awards	(5,752)	(27,812)
Common stock and share-based awards settled	(211)	(538)
Net cash used in financing activities	(309,679)	(168,803)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(30,762)	16,321
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period	119,184	131,436
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—End of period	88,422	147,757
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest (net of amounts capitalized)	118,181	106,132
Income taxes paid—net	65,464	4,885
NON-CASH INVESTING AND FINANCING ACTIVITIES
Property and equipment purchases included in accounts payable	15,533	18,656
Capital lease additions	81,553	76,554
Cashless exercise of equity awards	1,466	29,195
Contingent consideration payable for business acquisitions	$ 0	$ 4,200