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Basis of Presentation and General Information (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 01, 2021 | Jan. 01, 2021 | Sep. 25, 2020 | Jun. 26, 2020 | Oct. 01, 2021 | Sep. 25, 2020 | Dec. 27, 2019
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |  |
Revenue recognized as a result of change in contract liability | $ 1,700,000 |  | $ 6,000,000.0 |  | $ 7,700,000 | $ 15,800,000 |
Deferred commissions |  | $ 1,500,000 |  |  |  |  | $ 1,600,000
Commissions expense | 200,000 |  | $ 300,000 |  | 800,000 | $ 1,200,000 |
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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- Definition The amount of expense recognized in the current period for the periodic realization of capitalized fees that were paid to salespeople, distributors, brokers, and agents at the time of the conclusion of the sale. 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 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 2: 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=123570139&loc=d3e3602-108585 + Details
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