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DEFINED BENEFIT RETIREMENT PLAN (Details 2) £ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 25, 2021 USD ($) | Dec. 25, 2021 GBP (£) | Dec. 26, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Limit on employer contributions per annum | $ 17,765 | £ 13,100 |
Administrative costs of the Plan | 1,763 | £ 1,300 |
Plan assets | 761,170 |  | $ 741,650
Estimated Fair value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 14,000 |  | 31,935
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 14,000 |  | 31,935
Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 747,170 |  | 709,715
Mutual funds and diversified growth funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation percentage | 50.00% |  |
Temporary cash investments | Estimated Fair value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 14,000 |  | 31,935
Temporary cash investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 14,000 |  | 31,935
Corporate stock | Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 212,730 |  | 309,987
Leveraged inflation-linked gilt funds | Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 283,288 |  | 171,013
Corporate bonds | Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 107,945 |  | 115,577
Secured income asset funds | Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 143,207 |  | $ 113,138

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