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Credit Agreement (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 29, 2018 | Dec. 30, 2017
Senior Loan Agreement |  |
Borrowings outstanding | $ 5,000 |
Revolving credit facility |  |
Senior Loan Agreement |  |
Revolving credit facility, maximum capacity | 125,000 |
Borrowings outstanding | $ 5,000 | $ 0
Period of repayment | 12 months |
Letters of credit |  |
Senior Loan Agreement |  |
Revolving credit facility, maximum capacity | $ 15,000 |
Amount available under revolving credit facility reduced | $ 3,900 |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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