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Basis of Presentation and General Information (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Sep. 27, 2019 | Sep. 28, 2018 | Dec. 29, 2018 | Dec. 28, 2018 | Dec. 29, 2017
Basis Of Presentation And General Information [Line Items] |  |  |  |  |  |  |
Revenue recognized as a result of change in contract liability | $ 3,800,000 | $ 4,200,000 | $ 12,000,000 | $ 14,000,000 |  |  |
Deferred commissions |  |  |  |  |  | $ 1,200,000 | $ 1,400,000
Commissions expense | 400,000 | 100,000 | 900,000 | 700,000 |  |  |
Impairment loss recognized to capitalization of deferred commission | 0 | $ 0 | 0 | $ 0 |  |  |
Additional operating liabilities | 8,293,000 |  | 8,293,000 |  | $ 9,000,000 |  |
Additional operating ROU | $ 8,293,000 |  | $ 8,293,000 |  | $ 9,000,000 |  |
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=116634182&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=118932676&loc=d3e3602-108585 + Details
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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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