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Basis of Presentation and General Information (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 02, 2021 | Jan. 01, 2021 | Jun. 26, 2020 | Jul. 02, 2021 | Jun. 26, 2020 | Dec. 27, 2019
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Revenue recognized as a result of change in contract liability | $ 2,100,000 |  | $ 5,400,000 | $ 7,600,000 | $ 9,800,000 |
Deferred commissions |  | $ 1,500,000 |  |  |  | $ 1,600,000
Commissions expense | 300,000 |  | $ 500,000 | 500,000 | $ 900,000 |
Impairment loss recognized to capitalization of deferred commission | $ 0 |  |  | $ 0 |  |
ASU 2019-12 [Member] |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date | Dec. 15, 2020 |  |  | Dec. 15, 2020 |  |
Change in accounting principle, accounting standards update, adopted | true |  |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |  | true |  |
COVID-19 [Member] |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Global workforce reduced, percentage |  |  | 10.00% |  |  |
Restructuring costs |  |  | $ 5,000,000.0 |  |  |
Asset impairment charges |  | $ 3,900,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Business relationship agreement period |  |  |  | 6 months |  |
Maximum [Member] |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |
Business relationship agreement period |  |  |  | 12 months |  |
Customer contract period |  |  |  | 12 months |  |

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