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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($) $ in Thousands	Mar. 28, 2021	Dec. 27, 2020
Workers' Compensation Insurance and Reserves [Abstract]
Undiscounted workers’ compensation reserve	$ 271,593	$ 273,502
Less discount on workers’ compensation reserve	17,599	18,009
Workers' compensation reserve, net of discount	253,994	255,493
Less current portion	62,005	66,007
Long-term portion	$ 191,989	$ 189,486

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Workers' Compensation Insurance and Reserves [Abstract]

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Workers' Compensation Liability, Net of Discount

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Current year monetary amount of the change in worker's compensation reserve liability resulting from the discount applied to reduce the reserve to present value.

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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.

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-Publisher FASB
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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the noncurrent portion of the liabilities (due beyond one year; or beyond one operating cycle if longer).

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