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v3.20.2

Recently Adopted Accounting Standards - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings | $ 508,518 | $ 529,723 |
Allowance for doubtful accounts | $ 5,991 | $ 3,559 |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member |
Fair value, measurements, recurring |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Available-for-sale debt securities | $ 13,200 | $ 12,500 |
Cumulative Effect, Period Of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings |  |  | $ (100)

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