Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 26,816	$ 13,311
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	107,758	102,808
Gain on disposal of property and equipment	(310)	(1,306)
Amortization and write-off of deferred financing costs	1,282	2,433
Insurance proceeds relating to operating activities		2,479
Insurance benefit in net income		(7,083)
Amortization of Senior Notes original issue premium		(832)
Deferred tax provision (benefit)	12,280	(80)
Share-based compensation expense	3,342	4,786
Provision for doubtful accounts	4,745	3,781
Changes in operating assets and liabilities, net of business acquisitions:
Increase in receivables	(192,731)	(84,681)
Decrease (increase) in inventories	35,714	(49,987)
Increase in prepaid expenses and other assets	(25,652)	(4,945)
Increase in accounts payable and bank checks outstanding	236,980	257,938
Decrease in accrued expenses and other liabilities	(88,665)	(101,157)
Net cash provided by operating activities	121,559	137,465
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of businesses—net of cash	(62,501)	(38,318)
Proceeds from sales of property and equipment	724	1,923
Purchases of property and equipment	(70,125)	(36,884)
Investment in Avero, LLC		(7,658)
Net cash used in investing activities	(131,902)	(80,937)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from debt borrowings	578,459	538,000
Principal payments on debt and capital leases	(548,041)	(303,081)
Cash distribution to shareholders		(666,332)
Contingent consideration paid for business acquisition	(5,000)
Payment for debt financing costs and fees	(426)
Proceeds from employee share purchase plan	3,328
Proceeds from exercise of stock options	7,018
Tax withholding payments for net share settled equity awards	(3,966)
Proceeds from common stock sales		2,850
Common stock and share-based awards settled	(302)	(3,659)
Net cash provided by (used in) financing activities	31,070	(432,222)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	20,727	(375,694)
CASH AND CASH EQUIVALENTS—Beginning of period	131,090	517,802
CASH AND CASH EQUIVALENTS—End of period	151,817	142,108
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest (net of amounts capitalized)	29,590	39,839
Income taxes (refunded) paid—net	(39)	40
NON-CASH INVESTING AND FINANCING ACTIVITIES
Property and equipment purchases included in accounts payable	15,915	11,379
Capital lease additions	40,840	48,299
Cashless exercise of equity awards	$ 7,149
Contingent consideration payable for business acquisitions		$ 5,000