Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Restricted Cash	$ 17	$ 3,204	$ 236
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	191,894	166,315	202,370
Operating activities:
Net income	227,558	237,927	292,633
Loss (gain) from discontinued operations and dispositions, net of income taxes	195	(452)	(135,743)
Income from continuing operations	227,753	237,475	156,890
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:
Restructuring and other costs, net	29,428	11,144	12,657
Depreciation and amortization	214,025	180,588	105,000
Stock-based compensation	31,514	28,767	25,421
Pension and other post-retirement expense (benefits)	26,107	11,915	(10,439)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	3,881	14,639	2,162
Deferred taxes	(61,353)	(51,103)	28,854
Deferred Income Tax Expense (Benefit), Continuing Operations, Discontinuing Operations	(61,353)	(51,103)	28,854
Contingencies and Non-Cash Tax Matters	(424)	(671)	182
Amortization of deferred debt issuance costs, interest rate hedge and accretion of discounts	3,846	3,341	2,592
Loss (gain) on disposition of businesses and assets, net	2,469	(12,844)	309
Amortization of acquired inventory revaluation	21,590	19,272	6,188
Gain on Sale of Investments	0	(557)	0
Change in fair value of financial securities	(3,249)	0	0
Gain (Loss) on Extinguishment of Debt	32,541	0	0
Changes in assets and liabilities which (used) provided cash, excluding effects from companies purchased and divested:
Accounts receivable, net	(100,630)	(94,512)	(36,633)
Inventories, net	(9,607)	(30,183)	(17,923)
Accounts payable	7,351	8,900	34,331
Accrued expenses and other	(61,773)	(14,933)	(17,436)
Net cash provided by operating activities of continuing operations	363,469	311,238	292,155
Net cash used in operating activities of discontinued operations	0	(200)	(3,702)
Net cash provided by operating activities	363,469	311,038	288,453
Investing activities:
Capital expenditures	(76,331)	(93,253)	(39,089)
Proceeds from Derivative Instrument, Investing Activities	0	0	36,541
Payments to Acquire Investments	(6,387)	(7,019)	(10,783)
Payments to Acquire Intangible Assets	(5,000)	0	0
Proceeds from Divestiture of Businesses	550	38,027	1,100
Proceeds from surrender of life insurance policies	0	72	45
Activity related to acquisitions, net of cash and cash equivalents acquired	(400,405)	(97,686)	(1,527,183)
Net cash used in investing activities of continuing operations	(487,573)	(159,859)	(1,539,369)
Net cash provided by investing activities of discontinued operations	0	0	272,779
Net cash used in investing activities	(487,573)	(159,859)	(1,266,590)
Financing activities:
Payments on revolving credit facility	(1,692,489)	(1,264,000)	(235,965)
Proceeds from revolving credit facility	1,599,416	857,000	1,060,952
Payments of Senior Debt	(530,276)	0	0
Proceeds from sale of senior debt	847,195	369,340	0
Payments of debt financing costs	(9,879)	(2,634)	0
Net payments on other credit facilities	(14,975)	(28,383)	(2,831)
Settlement of cash flow hedges	(1,280)	(34,132)	(13,824)
Payments for acquisition-related contingent consideration	(29,942)	(12,800)	(8,940)
Excess tax benefit from exercise of common stock options	0	0
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised	19,732	24,833	18,004
Purchases of common stock	(6,313)	(57,445)	(3,834)
Dividends paid	(31,059)	(31,009)	(30,793)
Net cash provided by (used in) financing activities of continuing operations	150,130	(179,230)	782,769
Net cash used in financing activities of discontinued operations	0	0	(533)
Net cash provided by (used in) financing activities	150,130	(179,230)	782,236
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(447)	(8,004)	21,703
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	25,579	(36,055)	(174,198)
Cash and cash equivalents at beginning of year	163,111	202,134
Cash and cash equivalents at end of year	191,877	163,111	202,134
Supplemental disclosures of cash flow information
Interest Paid, Excluding Capitalized Interest, Operating Activities	82,693	56,451	35,780
Income taxes	$ 77,059	$ 59,844	$ 77,607