Acquisition Additional Acquisition (Details) - USD ($) $ in Thousands				3 Months Ended	9 Months Ended
	Jun. 26, 2018	Jun. 25, 2018	Jan. 22, 2018	Sep. 29, 2018	Sep. 29, 2018	Sep. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Total Purchase Price					$ 380,268	$ 20,000
Goodwill				$ 542,235	542,235		$ 359,688
SPG
Business Acquisition [Line Items]
Inventory		$ 43,170
Inventory fair value step-up		$ 8,900
Amortization of Inventory Step-up				$ 3,300	3,500
Business Acquisition, Date of Acquisition Agreement		Jun. 25, 2018
Total Purchase Price		$ 352,400
Goodwill		$ 175,476
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Identifiable Intangible Assets		$ 160,850
Payments to Acquire Businesses, Net of Cash Acquired		$ 341,200
Business Acquisition, Transaction Costs					$ 4,800
PSS
Business Acquisition [Line Items]
Inventory			$ 1,827
Business Acquisition, Date of Acquisition Agreement			Jan. 22, 2018
Total Purchase Price			$ 37,297
Goodwill			$ 8,804
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years 5 months
Identifiable Intangible Assets			$ 25,600
Flex
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement	Jun. 26, 2018
Total Purchase Price	$ 1,900
Customer Relationships [Member] | SPG
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		12 years
Identifiable Intangible Assets		$ 110,590
Technology-Based Intangible Assets [Member] | SPG
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		9 years
Identifiable Intangible Assets		$ 23,240
Trade Names [Member] | SPG
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		9 years
Identifiable Intangible Assets		$ 6,670
Other Intangible Assets [Member] | SPG
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		11 months
Identifiable Intangible Assets		$ 20,350