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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017
Income Taxes |  |  |  |
Provision (benefit) for income taxes | $ 4,371 | $ 1,970 |  |
Effective income tax rate (as a percent) | (19.80%) | (14.60%) |  |
Federal statutory rate (as a percent) | 21.00% |  |  | 35.00%
Gross unrecognized tax benefits | $ 2,600 |  |  |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | 2,000 |  |  |
Unrecognized tax benefits as a result of a lapse in the statute of limitations | 1,500 |  |  |
Amount of estimated decrease in unrecognized tax benefits | 400 |  |  |
2013 | Norwegian |  |  |  |
Income Taxes |  |  |  |
Adjustments to taxable income excluding interest and penalties | $ 30,000 |  |  |
Forecast | Norwegian |  |  |  |
Income Taxes |  |  |  |
Taxes payable during appeal process |  |  | $ 15,000 |

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