Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 444,294	$ 209,794	$ 167,518
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	377,877	421,371	399,247
Gain on disposal of property and equipment, net	(3,684)	(6,265)	(2,010)
Tangible asset impairment charges	1,807	125	6,293
Loss on extinguishment of debt		53,632
Amortization of deferred financing costs	5,725	7,252	13,261
Amortization of Senior Notes original issue premium		(1,664)	(3,330)
Insurance proceeds related to operating activities		10,499	23,243
Insurance benefit in net income		(10,499)	(20,083)
Deferred tax (benefit) provision	(122,928)	(80,434)	17,606
Share-based compensation expense	20,532	18,355	15,832
Provision for doubtful accounts	17,999	11,112	12,103
Changes in operating assets and liabilities, net of business acquisitions:
(Increase) decrease in receivables	(67,001)	21,555	9,600
Decrease (increase) in inventories	40,403	(100,579)	(55,047)
(Increase) decrease in prepaid expenses and other assets	(23,882)	6,199	(20,716)
Increase (decrease) in accounts payable and bank checks outstanding	16,570	131,044	(71,448)
Increase (decrease) in accrued expenses and other liabilities	40,735	(135,855)	63,699
Net cash provided by operating activities	748,447	555,642	555,768
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of businesses—net of cash	(182,210)	(122,294)	(69,481)
Proceeds from sales of property and equipment	25,521	16,827	5,048
Purchases of property and equipment	(221,281)	(164,395)	(187,409)
Investment in Avero, LLC		(7,658)
Investment in marketable securities		(484,624)
Insurance proceeds related to investing activities			2,771
Proceeds from redemption of industrial revenue bonds	22,139
Purchase of industrial revenue bonds			(22,139)
Net cash used in investing activities	(355,831)	(762,144)	(271,210)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from debt borrowings	2,549,982	2,706,535	22,139
Proceeds from debt refinancing		2,213,803
Principal payments on debt and capital leases	(2,650,157)	(4,140,760)	(109,489)
Repayment of industrial revenue bonds	(22,139)
Redemption of Old Senior Notes		(1,376,927)
Payment for debt financing costs and fees	(1,477)	(25,941)	(3,573)
Net proceeds from initial public offering		1,113,799
Cash distribution to shareholders		(666,332)
Contingent consideration paid for business acquisitions	(6,375)
Proceeds from employee share purchase plan	15,810	3,354
Proceeds from exercise of stock options	18,386
Tax withholding payments for net share-settled equity awards	(28,293)
Proceeds from common stock sales		2,850	500
Common stock repurchased	(280,000)
Common stock and share-based awards settled	(594)	(10,591)	(19,992)
Net cash used in financing activities	(404,857)	(180,210)	(110,415)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(12,241)	(386,712)	174,143
CASH AND CASH EQUIVALENTS—Beginning of year	131,090	517,802	343,659
CASH AND CASH EQUIVALENTS—End of year	118,849	131,090	517,802
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest (net of amounts capitalized)	158,310	222,742	345,732
Income taxes paid—net	11,127	4,571	7,861
NON-CASH INVESTING AND FINANCING ACTIVITIES
Property and equipment purchases included in accounts payable	30,664	50,349	26,885
Capital lease additions	91,149	80,118	$ 110,097
Cashless exercise of equity awards	30,136
Contingent consideration payable for acquisition of businesses	$ 4,200	8,375
Marketable securities transferred in connection with the legal defeasance of the CMBS Fixed Loan Facility		484,624
CMBS Fixed Loan Facility defeasance		471,615
Restricted cash transferred to cash and cash equivalents		$ 6,147