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LONG-TERM DEBT - Narrative (Details) |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 16, 2020 USD ($) | Jun. 28, 2020 USD ($) | Dec. 27, 2020 | Dec. 26, 2021 | Sep. 26, 2021 | Dec. 29, 2019 USD ($)
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 45,000,000 |  |  |  | $ 37,100,000
Current portion of long-term debt |  | 27,051,000 |  |  |  | 0
Debt instrument, debt covenant, unrestricted cash, threshold |  | $ 65,000,000 |  |  |  |
Debt instrument, asset coverage ratio, threshold |  | 1.00 |  |  |  |
Debt instrument, asset coverage ratio, percentage of accounts receivable |  | 60.00% |  |  |  |
Debt instrument, asset coverage ratio, unrestricted cash, threshold |  | $ 50,000,000 |  |  |  |
Debt instrument, asset coverage ratio |  | 14.7 |  |  |  |
Debt instrument, liquidity threshold |  | $ 150,000,000 |  |  |  |
Debt instrument, liquidity amount |  | 340,800,000 |  |  |  |
Debt instrument, covenant, EBITDA, trailing three quarters |  | 12,000,000 |  |  |  |
Debt instrument, covenant, EBITDA, trailing four quarters |  | $ 15,000,000 |  |  |  |
Fixed charge coverage ratio, threshold |  | 1.25 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 300,000,000.0 |  |  |  |  |
Maximum borrowing capacity subject to lender approval | $ 450,000,000.0 |  |  |  |  |
Long-term debt |  | $ 45,000,000.0 |  |  |  | 37,100,000
Remaining borrowing capacity |  | 248,800,000 |  |  |  |
Line of credit facility, maximum borrowing capacity, additional borrowings |  | $ 125,000,000 |  |  |  |
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 3.50% |  |  |  |
Additional debt instrument base rate |  | 0.75% |  |  |  |
Effective interest rate |  | 4.25% |  |  |  |
Revolving Credit Facility | Base rate |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Additional debt instrument base rate | 0.50% |  |  |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Unused capacity commitment fee percentage |  | 0.25% |  |  |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |
Revolving Credit Facility | Minimum | Base rate |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 0.25% | 0.25% |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Unused capacity commitment fee percentage |  | 0.50% |  |  |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 3.50% |  |  |  |  |
Revolving Credit Facility | Maximum | Base rate |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.50% | 1.50% |  |  |  |
Swingline loan |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 30,000,000.0 |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 17,100,000
Letters of credit outstanding |  | $ 6,200,000 |  |  |  |
Letter of credit |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 125,000,000.0 |  |  |  |  |
Letter of credit | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Additional letters of credit base rate |  | 0.50% |  |  |  |
Letter of credit | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |
Letter of credit | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 3.25% |  |  |  |
Forecast |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Leverage ratio, threshold |  |  |  | 3.00 | 4.00 |
Forecast | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.50% |  |  |

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