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Basis of Presentation and General Information (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 25, 2020 | Jun. 26, 2020 | Sep. 27, 2019 | Sep. 25, 2019 | Jun. 26, 2020 | Sep. 25, 2020 | Sep. 27, 2019 | Sep. 25, 2019 | Dec. 27, 2019 | Dec. 28, 2018
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue recognized as a result of change in contract liability | $ 6,000,000.0 |  | $ 3,800,000 |  |  | $ 15,800,000 | $ 12,000,000.0 |  |  |
Deferred commissions |  |  |  |  |  |  |  |  | $ 1,600,000 | $ 1,200,000
Commissions expense | 300,000 |  |  | $ 400,000 |  | 1,200,000 |  | $ 900,000 |  |
Impairment loss recognized to capitalization of deferred commission | 0 |  |  |  |  | 0 |  |  |  |
Income tax expense | $ 1,362,000 |  | $ 2,427,000 |  |  | $ 2,312,000 | $ 6,481,000 |  |  |
Effective tax rate expense (benefit) | (30.00%) |  | 26.00% |  |  | 33.00% | 24.00% |  |  |
Restructuring costs |  | $ 5,034,000 |  |  |  |  |  |  | $ 3,300,000 |
ASU 2016-13 [Member] |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 31, 2020 |  |  |  |  | Jan. 31, 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 |  |  | $ 5,000,000.0 |  |  |  |  |
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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