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DEBT (Details) - USD ($)	1 Months Ended		12 Months Ended
	May 31, 2020	Mar. 31, 2020	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018	Apr. 30, 2020
Debt Instrument [Line Items]
Proceeds from Revolving Credit Facility			$ 50,000,000	$ 0	$ 0
Interest costs incurred			815,000	$ 434,000	2,572,000
Interest costs capitalized			0		$ 157,000
Line of Credit Facility, Fair Value of Amount Outstanding			0
Notes payable
Debt Instrument [Line Items]
Proceeds from Revolving Credit Facility		$ 50,000,000
Notes Payable to Banks
Debt Instrument [Line Items]
Proceeds from bank debt						$ 10,000
Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			50,000,000
Incremental borrowing capacity			100,000,000
Revolving Credit Facility | Letter of credit | Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 15,000,000
Revolving Credit Facility | Minimum | Line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Revolving Credit Facility | Minimum | Line of credit | Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.00%
Revolving Credit Facility | Maximum | Line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
Revolving Credit Facility | Maximum | Line of credit | Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
First Amendment to the Credit Agreement | Line of credit
Debt Instrument [Line Items]
Debt instrument, minimum required liquidity	$ 25,000,000
First Amendment to the Credit Agreement | Minimum | Line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
First Amendment to the Credit Agreement | Minimum | Line of credit | Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%
First Amendment to the Credit Agreement | Maximum | Line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
First Amendment to the Credit Agreement | Maximum | Line of credit | Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%

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- Definition

Debt Instrument, Minimum Required Liquidity

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of interest capitalized during the period.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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Fair value of the amount outstanding under the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Including the current and noncurrent portions, the carrying value as of the balance sheet date of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer.

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