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DEFINED BENEFIT RETIREMENT PLAN (Details 2) £ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 29, 2018 GBP (£) | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Limit on employer contributions per annum | £ 10,000 | $ 12,690 |  |
Administrative costs of the Plan | £ 1,100 | 1,396 |  |
Plan assets at fair value |  | 61,546 | $ 18,451 |
Plan assets at NAV |  | 441,990 | 575,298 |
Total plan assets |  | 503,536 | 593,749 | $ 486,667
Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | $ 61,546 | 18,451 |
Common stock mutual funds and diversified growth funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage |  | 50.00% |  |
Temporary cash investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | $ 61,040 | 17,915 |
Temporary cash investments | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 61,040 | 17,915 |
Index linked gilts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at NAV |  | 122,711 | 158,011 |
Corporate bonds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at NAV |  | 80,454 | 88,905 |
Corporate stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 506 | 536 |
Plan assets at NAV |  | 183,750 | 212,505 |
Corporate stock | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 506 | 536 |
Diversified growth funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at NAV |  | $ 55,075 | $ 115,877 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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