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INCOME TAXES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
Income Tax Contingency [Line Items] |  |  |
Income tax expense related to tax cuts and jobs act |  | $ 138,636,000 |
Effective income tax rate (percent) | 28.80% | 94.50% | 22.30%
Deferred tax assets, carryforwards, federal | $ 68,658,000 |  |
Deferred tax assets, carryforwards, state and local | 60,546,000 |  |
Net operating loss carryforwards | 18,046,000 | $ 12,332,000 |
Additional deferred tax asset recognized, investment in partnership | 38,843,000 |  |
Reduction in basis due to amortization of deferred tax asset related to the investment in partnership [Line Items] | 12,383,000 |  |
Valuation allowance | (6,925,000) | (10,114,000) |
Additional deferred tax asset recognized, tax receivable agreement | 12,495,000 |  |
Increase in valuation allowance | 3,189,000 |  |
Uncertain tax positions | $ 0 | 0 |
Percentage of tax benefits due to equity owners | 85.00% |  |
Remaining percentage of tax benefits due to equity owners | 15.00% |  |
Other income recognized related to reduction of tax receivable agreement liability | $ 0 | $ 4,844,000 | $ 0
LLC interests acquired (in shares) | 2,692,660 | 1,003,585 |
Establishment of liabilities under tax receivable agreement |  | $ 18,973,000 | $ 100,063,000
Establishment of liabilities under tax receivable agreement | $ 203,725,000 |  |
Current portion of liabilities under tax receivable agreement | 5,804,000 | $ 937,000 |
Members' Equity |  |  |
Income Tax Contingency [Line Items] |  |  |
Other income recognized related to reduction of tax receivable agreement liability | 0 |  |
Federal Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | 16,791,000 |  |
State Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | 4,586,000 |  |
Limited Liability Company |  |  |
Income Tax Contingency [Line Items] |  |  |
Additional deferred tax asset recognized, investment in partnership | $ 168,451,000 |  |
LLC interests acquired (in shares) | 2,993,356 |  |

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