Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Operating activities
Net income	$ 119,519	$ 104,488	$ 80,866
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	38,311	33,800	29,701
Amortization of Intangible Assets	24,700	19,337	11,898
Impairment of goodwill and intangible assets		14,809
Provision for bad debts	2,414	1,769	164
Non-cash inventory charges	1,607	7,834
Net loss on pension settlement, net of tax			19,308
Loss on sale of product line		1,391
Loss on sale of property, plant, and equipment	3,634	813	1,253
Stock-based compensation	16,315	11,987	10,266
Excess tax benefit on share-based compensation		(3,421)	(1,891)
Deferred income taxes	17,063	(5,269)	11,479
Changes in operating assets and liabilities:
Accounts receivable	(11,087)	(22,779)	(3,397)
Inventories	(20,180)	8,539	(3,577)
Accounts payable	6,494	19,190	2,573
Accrued expenses (including post-retirement)	7,641	2,287	6,482
Accrued payroll and severance	3,709	6,131	5,883
Accrued taxes	39,276	(18,062)	557
Prepaid expenses and other	19,754	(2,711)	(5,739)
Net cash provided by operating activities	269,170	180,133	165,826
Investing activities
Acquisitions of businesses, net of cash acquired	(38,512)	(471,118)	(4,558)
Purchase of cost method investment			(3,500)
Proceeds from maturities of short-term investments	3,739	345
Decrease in entrusted loan	3,599	5,510	7,811
Purchases of property, plant, and equipment	(65,925)	(46,228)	(44,019)
Proceeds from sale of property, plant, and equipment	962	248	102
Net cash used in investing activities	(96,137)	(511,243)	(44,164)
Financing activities:
Proceeds of revolving credit facility	15,000	367,000	49,000
Proceeds of term loan	9,375	125,000
Proceeds of senior notes payable	125,000	226,428
Payments of term loan	(7,188)	(89,688)	(8,750)
Payments of revolving credit facility	(127,500)	(331,500)	(55,500)
Net (payments) proceeds related to stock-based award activities	2,373	(20,494)	(9,150)
Proceeds (payments) from entrusted loan	(3,599)	(5,510)	(7,811)
Debt issuance costs	(1,626)	(3,583)	(42)
Cash dividends paid	(31,770)	(27,866)	(24,341)
Excess tax benefit on share-based compensation		3,421	1,891
Purchases of common stock			(31,252)
Net cash (used in) provided by financing activities	(24,681)	284,196	(67,655)
Effect of exchange rate changes on cash and cash equivalents	6,200	(6,748)	(22,792)
Increase (decrease) in cash and cash equivalents	154,552	(53,662)	31,215
Cash and cash equivalents at beginning of year	275,124	328,786	297,571
Cash and cash equivalents at end of year	$ 429,676	$ 275,124	$ 328,786