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ORGANIZATION AND OPERATIONS OF THE COMPANY - Business Combination, Income Taxes and Recent Accounting Pronouncements (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 29, 2017 | Dec. 27, 2019 | Dec. 28, 2018 | Dec. 31, 2017 | Dec. 29, 2017
Income Taxes |  |  |  |  |
U.S. federal statutory rate (as a percent) |  | 21.00% | 21.00% | 35.00% | 34.00%
Deferred tax expense | $ 1,300,000 |  | $ 200,000 |  |
Valuation reserve related to California net operating losses |  | $ 86,000 | $ 86,000 |  |

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