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RETIREMENT BENEFIT PLANS (Details 6) - Pension Benefit [Member] - USD ($) | Jan. 02, 2021 | Dec. 28, 2019
--- | --- | ---
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | $ 78,361,102 | $ 74,359,558
Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 | 0
Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 5,230,134 | 6,625,560
Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 73,130,968 | 67,733,998
EasternCompanyCommonStock [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 5,230,134 | 6,625,560
EasternCompanyCommonStock [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 | 0
EasternCompanyCommonStock [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 5,230,134 | 6,625,560
Common/Collective Trust Funds [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 347,538 | 334,138
Common/Collective Trust Funds [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 | 0
Common/Collective Trust Funds [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 | 0
Common/Collective Trust Funds [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 347,538 | 334,138
Russell 10 Year STRIPS Fixed Income Fund [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 4,616,924
Russell 10 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 0
Russell 10 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 0
Russell 10 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 4,616,924
Russell 14 Year LDI Fixed Income Fund [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 26,452,904 | 11,387,626
Russell 14 Year LDI Fixed Income Fund [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 | 0
Russell 14 Year LDI Fixed Income Fund [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 | 0
Russell 14 Year LDI Fixed Income Fund [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 26,452,904 | 11,387,626
Russell 15 Year STRIPS Fixed Income Fund [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 3,050,389
Russell 15 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 0
Russell 15 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 | 0
Russell 15 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 3,050,389
Russell 8 Year LDI Fixed Income Fund [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 12,796,482
Russell 8 Year LDI Fixed Income Fund [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 0
Russell 8 Year LDI Fixed Income Fund [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 0
Russell 8 Year LDI Fixed Income Fund [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 12,796,482
Multi Asset Core Plus Fund [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 35,139,260 | 33,413,819
Multi Asset Core Plus Fund [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 | 0
Multi Asset Core Plus Fund [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 | 0
Multi Asset Core Plus Fund [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 35,139,260 | 33,413,819
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 5,183,933 |
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 |
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 |
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 5,183,933 |
Russell 25 Year LDI Fixed Income Fund [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 2,506,615 |
Russell 25 Year LDI Fixed Income Fund [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 |
Russell 25 Year LDI Fixed Income Fund [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 |
Russell 25 Year LDI Fixed Income Fund [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 2,506,615 |
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 3,500,718 |
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 |
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | 0 |
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year | $ 3,500,718 |
Russell 28 to 29 Year STRIPS Fixed Income Fund [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 2,134,620
Russell 28 to 29 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 0
Russell 28 to 29 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | 0
Russell 28 to 29 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member] |  |
Fair values of pension plans assets [Abstract] |  |
Fair value of plan assets at beginning of year |  | $ 2,134,620

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