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RETIREMENT BENEFIT PLANS, Fair Value of Pension Plan Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]    
Number of shares of employer common stock included plan assets (in shares) 217,018 217,018
Value of employer common stock included plan assets $ 4,535,676 $ 4,069,938
Dividends received from employer common stock $ 95,488 92,743
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Long-term target allocations for plan assets 50.00%  
Fixed income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Long-term target allocations for plan assets 50.00%  
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 65,627,501 $ 63,122,843
Number of shares of employer common stock included plan assets (in shares) 0 14,456
Value of employer common stock included plan assets $ 0 $ 232,124
Change in fair value of plan assets [Roll Forward]    
Fair value of plan assets at beginning of year 63,122,843 64,352,110
Actual return on plan assets 4,653,349 (1,340,977)
Employer contributions 1,249,726 3,006,202
Benefits paid (3,398,419) (2,894,492)
Fair value of plan assets at end of year 65,627,499 63,122,843
Pension Benefits [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,535,676 4,069,088
Pension Benefits [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 61,091,825 59,053,755
Pension Benefits [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Pension Benefits [Member] | Common/Collective Trust Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 276,129 236,209
Pension Benefits [Member] | Common/Collective Trust Funds [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Pension Benefits [Member] | Common/Collective Trust Funds [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 276,129 236,209
Pension Benefits [Member] | Common/Collective Trust Funds [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Pension Benefits [Member] | The Eastern Company Common Stock [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,535,676 4,069,088
Pension Benefits [Member] | The Eastern Company Common Stock [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,535,676 4,069,088
Pension Benefits [Member] | The Eastern Company Common Stock [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Pension Benefits [Member] | The Eastern Company Common Stock [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Pension Benefits [Member] | RITC Large Cap Defensive Equity Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 7,131,589 [1] 6,685,388
Pension Benefits [Member] | RITC Large Cap Defensive Equity Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [1] 0
Pension Benefits [Member] | RITC Large Cap Defensive Equity Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 7,131,589 [1] 6,685,388
Pension Benefits [Member] | RITC Large Cap Defensive Equity Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [1] 0
Pension Benefits [Member] | RITC Equity II Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,875,234 [2] 4,456,364
Pension Benefits [Member] | RITC Equity II Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0
Pension Benefits [Member] | RITC Equity II Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,875,234 [2] 4,456,364
Pension Benefits [Member] | RITC Equity II Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0
Pension Benefits [Member] | RITC Large Cap U.S. Equity Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,984,636 [3] 5,575,535
Pension Benefits [Member] | RITC Large Cap U.S. Equity Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [3] 0
Pension Benefits [Member] | RITC Large Cap U.S. Equity Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,984,636 [3] 5,575,535
Pension Benefits [Member] | RITC Large Cap U.S. Equity Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [3] 0
Pension Benefits [Member] | RITC International Fund with Active Currency [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8,178,635 [4] 7,796,625
Pension Benefits [Member] | RITC International Fund with Active Currency [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [4] 0
Pension Benefits [Member] | RITC International Fund with Active Currency [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8,178,635 [4] 7,796,625
Pension Benefits [Member] | RITC International Fund with Active Currency [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [4] 0
Pension Benefits [Member] | RITC Emerging Markets Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,373,089 [5] 3,350,136
Pension Benefits [Member] | RITC Emerging Markets Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [5] 0
Pension Benefits [Member] | RITC Emerging Markets Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,373,089 [5] 3,350,136
Pension Benefits [Member] | RITC Emerging Markets Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [5] 0
Pension Benefits [Member] | RITC Fixed Income I Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8,700,175 [6] 8,504,086
Pension Benefits [Member] | RITC Fixed Income I Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [6] 0
Pension Benefits [Member] | RITC Fixed Income I Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8,700,175 [6] 8,504,086
Pension Benefits [Member] | RITC Fixed Income I Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [6] 0
Pension Benefits [Member] | RITC 8 Year LDI Fixed Income Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,499,390 [7] 1,478,701
Pension Benefits [Member] | RITC 8 Year LDI Fixed Income Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 8 Year LDI Fixed Income Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,499,390 [7] 1,478,701
Pension Benefits [Member] | RITC 8 Year LDI Fixed Income Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 10 Year LDI Fixed Income Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,851,317 [7] 1,840,616
Pension Benefits [Member] | RITC 10 Year LDI Fixed Income Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 10 Year LDI Fixed Income Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,851,317 [7] 1,840,616
Pension Benefits [Member] | RITC 10 Year LDI Fixed Income Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 12 Year LDI Fixed Income Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,122,411 [7] 2,119,786
Pension Benefits [Member] | RITC 12 Year LDI Fixed Income Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 12 Year LDI Fixed Income Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,122,411 [7] 2,119,786
Pension Benefits [Member] | RITC 12 Year LDI Fixed Income Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 14 Year LDI Fixed Income Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,790,209 [7] 3,795,220
Pension Benefits [Member] | RITC 14 Year LDI Fixed Income Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 14 Year LDI Fixed Income Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,790,209 [7] 3,795,220
Pension Benefits [Member] | RITC 14 Year LDI Fixed Income Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 16 Year LDI Fixed Income Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,650,440 [7] 5,615,278
Pension Benefits [Member] | RITC 16 Year LDI Fixed Income Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 16 Year LDI Fixed Income Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,650,440 [7] 5,615,278
Pension Benefits [Member] | RITC 16 Year LDI Fixed Income Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [7] 0
Pension Benefits [Member] | RITC 15 Year STRIPS Fixed Income Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,504,395 [8] 2,606,554
Pension Benefits [Member] | RITC 15 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [8] 0
Pension Benefits [Member] | RITC 15 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,504,395 [8] 2,606,554
Pension Benefits [Member] | RITC 15 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [8] 0
Pension Benefits [Member] | RITC 10 Year STRIPS Fixed Income Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,407,518 [8] 1,411,574
Pension Benefits [Member] | RITC 10 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [8] 0
Pension Benefits [Member] | RITC 10 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,407,518 [8] 1,411,574
Pension Benefits [Member] | RITC 10 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [8] 0
Pension Benefits [Member] | RITC 28 to 29 Year STRIPS Fixed Income Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 464,106 [8] 543,357
Pension Benefits [Member] | RITC 28 to 29 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [8] 0
Pension Benefits [Member] | RITC 28 to 29 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 464,106 [8] 543,357
Pension Benefits [Member] | RITC 28 to 29 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [8] 0
Pension Benefits [Member] | Insurance Contracts [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,282,552 3,038,326
Pension Benefits [Member] | Insurance Contracts [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Pension Benefits [Member] | Insurance Contracts [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,282,552 3,038,326
Pension Benefits [Member] | Insurance Contracts [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,287,350 1,188,289
Change in fair value of plan assets [Roll Forward]    
Fair value of plan assets at beginning of year 1,188,289 1,149,204
Actual return on plan assets 99,061 39,085
Employer contributions 151,399 122,947
Benefits paid (151,399) (122,947)
Fair value of plan assets at end of year 1,287,350 1,188,289
Other Postretirement Benefits [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Other Postretirement Benefits [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Other Postretirement Benefits [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,287,350 1,188,289
Change in fair value of plan assets [Roll Forward]    
Fair value of plan assets at beginning of year 1,188,289 1,149,204
Change due to availability of final actual assets and census data 0 0
Actual return on plan assets 99,061 39,085
Employer contributions 92,898 81,360
Benefits paid (92,898) (81,360)
Fair value of plan assets at end of year 1,287,350 1,188,289
Other Postretirement Benefits [Member] | Insurance Contracts [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,287,350 1,188,289
Other Postretirement Benefits [Member] | Insurance Contracts [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Other Postretirement Benefits [Member] | Insurance Contracts [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Other Postretirement Benefits [Member] | Insurance Contracts [Member] | Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 1,287,350 $ 1,188,289
[1] The investment objective of the RITC (formerly Russell) Large Cap Defensive Equity Fund is to outperform the Russell 1000 Defensive Index while managing volatility and maintaining diversification similar to the Index over a full market cycle. The Fund invests in common stocks of large and medium cap U.S. companies, employing a multi-manager approach with advisors using distinct methods to identify medium to large cap U.S. stocks with positive excess return potential. The defensive style of investing emphasizes investments in equities of companies expected to have lower than average stock price volatility, higher financial quality and/or stable business fundamentals.
[2] The RITC Equity II Fund has an objective to provide a favorable total return primarily through capital appreciation. Aims to outperform the Russell 2500 Index with above-average consistency while managing volatility and maintaining diversification similar to the Index over a full market cycle. The fund invests in common stocks of U.S. small cap companies. It employs a multi-style (growth and market-oriented, value), multi-manager approach. Advisors employ distinct yet complementary styles in their stock selection, focusing on factors such as: undervalued or under-researched companies, special situations, emerging growth, asset plays and turnarounds.
[3] The investment objective of the RITC Large Cap U.S. Equity Fund is to outperform the Russell 1000 Index with above-average consistency over a full market cycle. The fund invests in common stocks of large and medium cap U.S. companies. Employs a multi-style, multi-manager approach whereby portions of the fund are allocated to different money managers who employ distinct styles. The number of advisors and number of stocks (150 - 200) is more concentrated than other Russell multi-style large cap U.S. funds.
[4] The RITC International Fund with Active Currency seeks to provide long-term growth of Capital. Aims to outperform the Russell Development ex-U.S. Large Cap Index Net while managing volatility and maintaining diversification similar to the index over a full market cycle. The fund invests primarily in the equities of non-U.S. developing markets and currency of global markets. Employs multiple managers with distinct investment styles, which are intended to be complementary. Seeks to capitalize on the stock selection abilities of its active manager. The Fund typically has moderate country and sector weights relative to the index. Also believe active currency management is an attractive strategy with the potential to deliver excess return.
[5] The RITC Emerging Markets Fund seeks to provide the potential for long-term growth of Capital. Aims to outperform the Russell Emerging Markets Index Net over a full market cycle. The fund invests in equity securities of companies located in, or are economically tied to, emerging market countries. Securities are denominated principally in foreign currencies and are typically held outside the U.S. The Fund employs a multi-style (growth, market-oriented and value) and multi-manager approach whereby portions of the fund are allocated to different money managers who employ distinct styles.
[6] The RITC Fixed Income I Fund is designed to provide current income and capital appreciation through a variety of diversified strategies. The Fund seeks favorable returns comparable to the broad fixed income market, as measured by the Barclays U.S. Aggregate Bond Index. The fund primarily invests in fixed income securities representing diverse sectors and maturities. Advisors use diversified strategies including sector rotation, modest interest rate timing, security selection and tactical use of high yield and emerging market bonds. It is actively managed with multiple advisors employing distinct yet complementary strategies and different technologies to insure prudent diversification over a broad spectrum of investments.
[7] 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.
[8] 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.