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Stock-based Compensation and Other Stock Plans - Performance Awards Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Performance Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average contractual term (in years) | 3 years |  |  |  |
Maximum stock percentage to be awarded | 100.00% |  |  |  |
Performance period | 3 years |  |  |  |
Weighted-average grant date fair value granted (in dollars per share) | $ 155.34 | $ 155.92 |  |  |
Performance awards shares paid out (in shares) | 21,184 | 32,114 |  |  |
Unrecognized compensation cost related to non-vested award | $ 7.5 |  |  |  |
Cost expected to be recognized over weighted-average period, in years | 1 year 9 months 18 days |  |  |  |
Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period | 1 year |  |  |  |
Cliff vesting schedule | 2 years |  |  |  |
Granted (in shares) |  |  | 0 | 33,170 | 13,648

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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