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RETIREMENT BENEFIT PLANS, Fair Value of Pension Plan Assets (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Equity Securities [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Long-term target allocations for plan assets |  | 50.00% |  |
Fixed income [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Long-term target allocations for plan assets |  | 50.00% |  |
Pension Benefit [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | $ 74,359,558 | $ 66,170,875 | $ 72,098,772
Number of shares of employer common stock included plan assets (in shares) |  | 0 | 0 |
Cash dividends received |  | $ 95,488 | $ 95,488 |
Pension Benefit [Member] | Level 1 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 6,625,560 | 5,247,495 |
Pension Benefit [Member] | Level 2 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 67,733,998 | 60,923,380 |
Pension Benefit [Member] | Level 3 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Pension Benefit [Member] | Common/Collective Trust Funds [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 334,138 | 306,882 |
Pension Benefit [Member] | Common/Collective Trust Funds [Member] | Level 1 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Pension Benefit [Member] | Common/Collective Trust Funds [Member] | Level 2 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 334,138 | 306,882 |
Pension Benefit [Member] | Common/Collective Trust Funds [Member] | Level 3 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Pension Benefit [Member] | Equity Securities [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Value of employer common stock included plan assets |  | 0 | 0 |
Pension Benefit [Member] | The Eastern Company Common Stock [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 6,625,560 | 5,247,495 |
Pension Benefit [Member] | The Eastern Company Common Stock [Member] | Level 1 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 6,625,560 | 5,247,495 |
Pension Benefit [Member] | The Eastern Company Common Stock [Member] | Level 2 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Pension Benefit [Member] | The Eastern Company Common Stock [Member] | Level 3 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Pension Benefit [Member] | Russell Multi Asset Core Plus Fund [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [1] | 33,413,819 | 30,611,519 |
Pension Benefit [Member] | Russell Multi Asset Core Plus Fund [Member] | Level 1 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [1] | 0 | 0 |
Pension Benefit [Member] | Russell Multi Asset Core Plus Fund [Member] | Level 2 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [1] | 33,413,819 | 30,611,519 |
Pension Benefit [Member] | Russell Multi Asset Core Plus Fund [Member] | Level 3 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [1] | 0 | 0 |
Pension Benefit [Member] | Russell 8 Year LDI Fixed Income Fund [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 12,796,482 | 5,735,993 |
Pension Benefit [Member] | Russell 8 Year LDI Fixed Income Fund [Member] | Level 1 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 0 | 0 |
Pension Benefit [Member] | Russell 8 Year LDI Fixed Income Fund [Member] | Level 2 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 12,796,482 | 5,735,993 |
Pension Benefit [Member] | Russell 8 Year LDI Fixed Income Fund [Member] | Level 3 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 0 | 0 |
Pension Benefit [Member] | Russell 14 Year LDI Fixed Income Fund [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 11,387,626 | 17,044,596 |
Pension Benefit [Member] | Russell 14 Year LDI Fixed Income Fund [Member] | Level 1 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 0 | 0 |
Pension Benefit [Member] | Russell 14 Year LDI Fixed Income Fund [Member] | Level 2 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 11,387,626 | 17,044,596 |
Pension Benefit [Member] | Russell 14 Year LDI Fixed Income Fund [Member] | Level 3 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [2] | 0 | 0 |
Pension Benefit [Member] | Russell 15 Year STRIPS Fixed Income Fund [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 3,050,389 | 1,811,436 |
Pension Benefit [Member] | Russell 15 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 0 | 0 |
Pension Benefit [Member] | Russell 15 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 3,050,389 | 1,811,436 |
Pension Benefit [Member] | Russell 15 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 0 | 0 |
Pension Benefit [Member] | Russell 10 Year STRIPS Fixed Income Fund [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 4,616,924 | 3,408,879 |
Pension Benefit [Member] | Russell 10 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 0 | 0 |
Pension Benefit [Member] | Russell 10 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 4,616,924 | 3,408,879 |
Pension Benefit [Member] | Russell 10 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 0 | 0 |
Pension Benefit [Member] | Russell 28 to 29 Year STRIPS Fixed Income Fund [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Fair value of plan assets | [3] | 2,134,620 | 2,004,075 |
Pension Benefit [Member] | 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 | [3] | 0 | 0 |
Pension Benefit [Member] | 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 | [3] | 2,134,620 | 2,004,075 |
Pension Benefit [Member] | 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 | [3] | $ 0 | $ 0 |
Pension Benefit [Member] | Equity Securities, Common Stock [Member] |  |  |  |
Fair values of pension plans assets [Abstract] |  |  |  |
Number of shares of employer common stock included plan assets (in shares) |  | 217,018 | 217,018 |
Value of employer common stock included plan assets |  | $ 6,625,560 | $ 5,247,495 |
[1] | The investment objective of the RITC (formerly Russell) Multi-Asset Core Plus Fund seeks to provide long-term growth of capital over a market cycle by offering a diversified portfolio of funds and separate accounts investing in global stock, return seeking fixed income, commodities, global real estate and opportunistic investments. They hold a dynamic mix of underlying Russell Investments funds and/or separate accounts. Russell Investments is a strong proponent of disciplined strategic asset allocation and rebalancing strategies, and believes that unstable movements in the market have the potential to create opportunities. By identifying short-term mispricing, and making small tactical adjustments to the Multi-Asset Core Plus Fund, they believe there is potential to enhance returns while continuing to manage risks.
[2] | The Target Duration LDI Fixed Income Funds seek to outperform their respective Barclays-Russell LDI Indexes over a full market cycle. These Funds invest primarily in investment grade corporate bonds that closely match those found in discount curves used to value U.S. pension liabilities. They seek to provide additional incremental return through modest interest rate timing, security selection and tactical use of non-credit sectors. Generally, for use in combination with other bond funds to gain additional credit exposure, with the goal of reducing the mismatch between a plan's assets and liabilities.
[3] | The STRIPS (Separate Trading of Registered Interest and Principal of Securities) Funds seek to provide duration and Treasury exposure by investing in an optimized subset of the STRIPS universe with a similar duration profile as the Barclays U.S. Treasury STRIPS 10-11 year, 16-16 year or 28-29 year Index. These passively managed funds are generally used with other bond funds to add additional duration to the asset portfolio. This will help reduce the mismatch between a plan's assets and liabilities.

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