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DEFINED BENEFIT RETIREMENT PLAN (Details 2) £ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 26, 2020 USD ($) | Dec. 26, 2020 GBP (£) | Dec. 28, 2019 USD ($)
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 | 741,650 |  | $ 604,396
Estimated Fair value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 31,935 |  | 38,388
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 31,935 |  | 38,388
Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 709,715 |  | 566,008
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 | $ 31,935 |  | 38,388
Temporary cash investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 31,935 |  | 38,388
Corporate stock | Estimated Fair value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 |  | 0
Corporate stock | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 |  | 0
Corporate stock | Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 309,987 |  | 234,612
Leveraged inflation-linked gilt funds | Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 171,013 |  | 123,637
Corporate bonds | Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 115,577 |  | 97,638
Secured income asset funds | Fair Value Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 113,138 |  | $ 110,121

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