Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
OPERATING ACTIVITIES
Net income	$ 139,082	$ 164,565	$ 119,519
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	52,477	51,003	38,311
Amortization of intangibles	40,026	52,190	24,700
Impairment charges	322	2,218	0
Deferred revenue	(318)	3,965	0
Non-cash inventory charges	0	36,927	1,607
Stock-based compensation	19,046	27,431	16,315
Loss (gain) on investments and other assets	4,854	(670)	0
Deferred income taxes	(1,147)	(4,679)	17,063
Other	6,638	620	6,048
Changes in operating assets and liabilities:
Trade receivables	28,497	(3,539)	(11,087)
Inventories	22,094	(33,971)	(20,180)
Accounts payable	(22,574)	13,708	6,494
Accrued liabilities and income taxes	(54,242)	29,329	50,626
Prepaid expenses and other assets	10,573	(7,269)	19,754
Net cash provided by operating activities	245,328	331,828	269,170
INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired	(775)	(318,474)	(38,512)
Proceeds from sales and maturities of short-term investments	0	1,407	3,739
Decrease in entrusted loan	0	0	3,599
Purchases of property, plant, and equipment	(61,895)	(74,753)	(65,925)
Proceeds from sale of property, plant, and equipment	6,213	9,572	962
Net cash used in investing activities	(56,457)	(382,248)	(96,137)
FINANCING ACTIVITIES
Proceeds of revolving credit facility	0	60,000	15,000
Proceeds of term loan	0	75,000	9,375
Proceeds from senior notes payable	0	175,000	125,000
Payments of term loan	(10,000)	(42,500)	(7,188)
Payments of revolving credit facility	0	(60,000)	(127,500)
Net proceeds (payments) related to stock-based award activities	7,800	18,857	(2,373)
Payments of entrusted loan	0	0	(3,599)
Cash dividends paid	(44,689)	(39,993)	(31,770)
Purchases of common stock	(99,387)	(63,564)	0
Other	0	(903)	(1,626)
Net cash (used in) provided by financing activities	(146,276)	121,897	(24,681)
Effect of exchange rate changes on cash and cash equivalents	(1,189)	(11,420)	6,200
Increase in cash and cash equivalents	41,406	60,057	154,552
Cash and cash equivalents at beginning of year	489,733	429,676	275,124
Cash and cash equivalents at end of year	531,139	489,733	429,676
Supplementary Cash Flow Information
Cash paid during the period for interest	21,240	18,462	10,569
Cash paid during the period for income taxes, net of refunds	40,518	41,904	18,088
Capital expenditures, not yet paid	$ 11,110	$ 0	$ 0