Goodwill - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 531,387		$ 531,387		$ 549,916
Accumulated Amortization	(217,915)		(217,915)		(263,701)
Net	313,472		313,472		$ 286,215
Amortization of Intangible Assets	11,620	$ 12,645	$ 37,095	$ 37,909
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life			10 years		10 years
Gross Carrying Amount	421,640		$ 421,640		$ 440,167
Accumulated Amortization	(212,241)		(212,241)		(259,337)
Net	209,399		$ 209,399		$ 180,830
Developed Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life			5 years		5 years
Gross Carrying Amount	6,340		$ 6,340		$ 6,340
Accumulated Amortization	(3,994)		(3,994)		(3,043)
Net	2,346		$ 2,346		$ 3,297
Amortizable Trade Name [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life			5 years		5 years
Gross Carrying Amount	2,407		$ 2,407		$ 2,409
Accumulated Amortization	(1,680)		(1,680)		(1,321)
Net	727		727		1,088
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,000		101,000		101,000
Accumulated Amortization	0		0		0
Net	$ 101,000		$ 101,000		$ 101,000

Finite And Indefinite Lived Intangible Assets Gross.

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Finite And Indefinite Lived Intangible Assets [Line Items].

+ References

No definition available.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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