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COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Long-term commitment
Outstanding purchase commitments on capital projects	$ 22.8
Surety Bonds and Letters of Credit
Outstanding letters of credit	$ 41.0	$ 37.3
Remediation reserves
Environmental reserves, discount rate (as a percent)	0.00%
Estimated costs to complete future remediation efforts	$ 1.9	$ 2.0
Open Projects
Surety Bonds and Letters of Credit
Payment and performance bonds outstanding	15.4
Completed Projects
Surety Bonds and Letters of Credit
Payment and performance bonds outstanding	5.2
Insurance Contracts
Surety Bonds and Letters of Credit
Outstanding letters of credit	33.9
Revenue Bonds
Surety Bonds and Letters of Credit
Outstanding letters of credit	$ 7.1

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Amount of outstanding payment and performance bonds outstanding as of the report date.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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