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Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020	Jul. 03, 2021	Apr. 03, 2021	Jan. 02, 2021	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of a change in accounting principle	$ 204,285	$ 204,395	$ 204,285	$ 204,395	$ 197,831	$ 211,328	$ 209,019	$ 202,215	$ 196,360	$ 197,751
Bad debt expense (recovery), net	55	271	44	228
Reimbursable expenses	15,727	13,150	49,382	44,395
Retained Earnings
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of a change in accounting principle	$ 213,367	$ 212,368	$ 213,367	$ 212,368	$ 204,576	$ 219,922	$ 216,999	$ 208,784	$ 204,679	200,249
Cumulative Effect Period of Adoption, Adjustment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of a change in accounting principle										(203)
Cumulative Effect Period of Adoption, Adjustment | Retained Earnings
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of a change in accounting principle										(203)
ASC 326 | Cumulative Effect Period of Adoption, Adjustment | Retained Earnings
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of a change in accounting principle										$ (200)

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Amount of reimbursable expenses, which include expenses for travel and other out-of-pocket expenses, outside consultants, and other reimbursable expenses. Revenues include reimbursable expenses.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
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