Goodwill - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 398,837		$ 398,837		$ 409,035
Accumulated Amortization	(194,379)		(194,379)		(175,216)
Net	204,458		204,458		$ 233,819
Amortization of Intangible Assets	$ 9,202	$ 9,352	27,844	$ 29,041
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	12 years				12 years
Gross Carrying Amount	$ 324,837		324,837		$ 335,027
Accumulated Amortization	(168,689)		(168,689)		(157,151)
Net	$ 156,148		156,148		$ 177,876
Amortizable trade name
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	8 years				8 years
Gross Carrying Amount	$ 74,000		74,000		$ 74,008
Accumulated Amortization	(25,690)		(25,690)		(18,065)
Net	$ 48,310		$ 48,310		$ 55,943

Finite And Indefinite Lived Intangible Assets Gross.

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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

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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

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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/disclosureRef
-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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

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