Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 67,317	$ 26,816
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	81,403	107,758
Gain on disposal of property and equipment—net	(82)	(310)
Amortization of deferred financing costs	1,030	1,282
Deferred tax provision	26,922	12,280
Share-based compensation expense	7,066	3,342
Provision for doubtful accounts	2,997	4,745
Changes in operating assets and liabilities, net of business acquisitions:
Increase in receivables	(134,803)	(192,731)
Decrease in inventories	750	35,714
Increase in prepaid expenses and other assets	(11,847)	(25,609)
Increase in accounts payable and bank checks outstanding	282,388	236,980
Decrease in accrued expenses and other liabilities	(131,559)	(88,665)
Net cash provided by operating activities	191,582	121,602
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of businesses—net of cash	(757)	(62,501)
Proceeds from sales of property and equipment	762	724
Purchases of property and equipment	(57,179)	(70,125)
Net cash used in investing activities	(57,174)	(131,902)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from debt borrowings	863,503	578,459
Principal payments on debt and capital leases	(1,041,875)	(548,041)
Contingent consideration paid for business acquisitions	(500)	(5,000)
Payment for debt financing costs and fees		(426)
Proceeds from employee share purchase plan	3,819	3,328
Proceeds from exercise of stock options	7,454	7,018
Tax withholding payments for net share-settled equity awards	(269)	(3,966)
Common stock and share-based awards settled	(84)	(302)
Net cash (used in) provided by financing activities	(167,952)	31,070
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(33,544)	20,770
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period	119,184	131,436
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—End of period	85,640	152,206
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest (net of amounts capitalized)	32,852	29,590
Income taxes paid (refunded)—net	902	(39)
NON-CASH INVESTING AND FINANCING ACTIVITIES
Property and equipment purchases included in accounts payable	21,809	15,915
Capital lease additions	50,257	40,840
Cashless exercise of equity awards	$ 377	$ 7,149