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Goodwill - Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 28, 2019 | Jun. 29, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 31, 2018
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount | $ 502,971 |  |  | $ 502,971 |  | $ 602,330
Accumulated Amortization | (225,251) |  |  | (225,251) |  | (229,686)
Net | 277,720 |  |  | 277,720 |  | $ 372,644
Amortization of Intangible Assets | 10,443 |  | $ 11,620 | $ 33,786 | $ 37,095 |
Customer Relationships [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-Average Life |  |  |  | 10 years |  | 11 years
Gross Carrying Amount | 426,564 |  |  | $ 426,564 |  | $ 475,050
Accumulated Amortization | (217,736) |  |  | (217,736) |  | (221,822)
Net | 208,828 |  |  | $ 208,828 |  | $ 253,228
Developed Technology [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-Average Life |  |  |  |  |  | 5 years
Gross Carrying Amount |  |  |  |  |  | $ 6,340
Accumulated Amortization |  |  |  |  |  | (4,311)
Net |  |  |  |  |  | $ 2,029
Amortizable Trade Name [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-Average Life |  |  |  | 8 years |  | 9 years
Gross Carrying Amount | 76,407 |  |  | $ 76,407 |  | $ 19,940
Accumulated Amortization | (7,515) |  |  | (7,515) |  | (3,553)
Net | $ 68,892 |  |  | $ 68,892 |  | 16,387
Trade Names [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  |  | 101,000
Impairment of Intangible Assets, Finite-lived |  | $ 55,000 |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | 46,000 |  |  |  |
Accumulated Amortization |  |  |  |  |  | 0
Net |  |  |  |  |  | $ 101,000
Net of Tax [Member] | Trade Names [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | $ 34,653 |  |  |  |

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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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