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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value (Details) - USD ($) $ in Thousands | Sep. 25, 2021 | Dec. 26, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets recorded for the investments held | $ 29,481 | $ 35,125
Property, plant and equipment | 617,313 | 597,727
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities | 29,580 | 35,327
Derivative financial instruments, net | 0 |
Derivative financial instruments, net |  | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities | 0 | 0
Derivative financial instruments, net | 7,001 |
Derivative financial instruments, net |  | (5,911)
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities | 0 | 0
Derivative financial instruments, net | 0 |
Derivative financial instruments, net |  | 0
Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities | 29,580 | 35,327
Derivative financial instruments, net | 7,001 |
Derivative financial instruments, net |  | (5,911)
Trade Name |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying value of trade names | 69,381 | 66,998
Offshore and Other Complex Steel Structures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Property, plant and equipment | 38,694 |
Offshore and Other Complex Steel Structures | Customer Relationships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finite-lived intangible assets, net | 4,927 |
Offshore and Other Complex Steel Structures | Trade Name |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying value of trade names | 8,386 |
Delta E M D Pty Ltd |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of remaining ownership | $ 99 | $ 202

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