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Significant Accounting Policies - Basis of Presentation and Principles of Consolidation (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 30, 2017
Significant Accounting Policies |  |
Length of fiscal year | 364 days | 364 days
Number of days in each fiscal quarter for 52-week fiscal year | 91 days |
Low end of range |  |
Significant Accounting Policies |  |
Length of fiscal year | 364 days |
High end of range |  |
Significant Accounting Policies |  |
Length of fiscal year | 371 days |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. 0 + References No definition available. + Details
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- Definition Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + References No definition available. + Details
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