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Stock Incentive Plans - Long Term Cash Incentive Plan (Details) $ in Millions | 12 Months Ended
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Dec. 27, 2020 USD ($) | Dec. 29, 2019 USD ($) Period | Dec. 30, 2018 USD ($) | Dec. 31, 2017 Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of performance periods | Period |  | 3 |  | 1
Deferred compensation, excluding share-based payments and retirement benefits | Long-term cash incentive plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance and vesting period | 3 years | 1 year |  | 3 years
LTI Cash Compensation Expense | $ 0.2 | $ 0.2 | $ 0.7 |
Payments of Deferred Compensation, Cash Based Arrangements | 0.5 | 0.0 |  |
Deferred compensation, excluding share-based payments and retirement benefits | Long-term cash incentive plan | Accrued payroll liabilities and payroll-related liabilities |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long-term cash incentive plan liability | $ 0.8 | $ 1.1 |  |

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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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