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Retirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 29, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Funded status of pension benefit plans and postretirement benefit plan | As of December 29, 2012 and December 31, 2011, the status of the Company's pension benefit plans and postretirement benefit plan was as follows:
|  | Pension Benefit |  |  | Postretirement Benefit |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Benefit obligation at beginning of year |  | $ | 64,709,379 |  |  | $ | 56,979,912 |  |  | $ | 3,069,155 |  |  | $ | 2,629,606 |
Change due to availability of final actual assets and census data |  |  | — |  |  |  | — |  |  |  | 151,397 |  |  |  | — |
Plan amendment |  |  | 831,201 |  |  |  | — |  |  |  | — |  |  |  | — |
Service cost |  |  | 2,642,373 |  |  |  | 2,141,306 |  |  |  | 173,613 |  |  |  | 126,464 |
Interest cost |  |  | 2,868,528 |  |  |  | 2,949,672 |  |  |  | 143,388 |  |  |  | 136,752 |
Actuarial loss |  |  | 6,117,680 |  |  |  | 4,864,293 |  |  |  | 301,076 |  |  |  | 316,038 |
Benefits paid |  |  | (2,343,192 | ) |  |  | (2,225,804 | ) |  |  | (126,124 | ) |  |  | (139,705 | )
Benefit obligation at end of year |  | $ | 74,825,969 |  |  | $ | 64,709,379 |  |  | $ | 3,712,505 |  |  | $ | 3,069,155 |
|  | Pension Benefit |  |  | Postretirement Benefit |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Fair value of plan assets at beginning of year |  | $ | 48,897,760 |  |  | $ | 42,966,643 |  |  | $ | 1,215,998 |  |  | $ | 1,168,235 |
Change due to availability of final actual assets and census data |  |  | — |  |  |  | — |  |  |  | (3,005 | ) |  |  | (5,157 | )
Actual return on plan assets |  |  | 4,311,348 |  |  |  | 700,623 |  |  |  | 46,255 |  |  |  | 52,920 |
Employer contributions |  |  | 3,778,692 |  |  |  | 7,456,298 |  |  |  | 71,655 |  |  |  | 139,705 |
Benefits paid |  |  | (2,343,192 | ) |  |  | (2,225,804 | ) |  |  | (126,124 | ) |  |  | (139,705 | )
Fair value of plan assets at end of year |  | $ | 54,644,608 |  |  | $ | 48,897,760 |  |  | $ | 1,204,779 |  |  | $ | 1,215,998 |
|  | Pension Benefit |  |  | Postretirement Benefit |
Funded Status |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Net amount recognized in the balance sheet |  | $ | (20,181,361 | ) |  | $ | (15,811,622 | ) |  | $ | (2,507,726 | ) |  | $ | (1,853,157 | )
Amounts recognized in accumulated other comprehensive income | Amounts recognized in accumulated other comprehensive income consist of:
| Pension Benefit |  | Postretirement Benefit |
| 2012 |  | 2011 |  | 2012 |  | 2011 |
Net loss |  | $ | (28,346,776 | ) |  | $ | (23,721,356 | ) |  | $ | (621,467 | ) |  | $ | (115,205 | )
Prior service (cost) credit |  |  | (937,936 | ) |  |  | (327,784 | ) |  |  | 135,396 |  |  |  | 159,285 |
|  | $ | (29,284,712 | ) |  | $ | (24,049,140 | ) |  | $ | (486,071 | ) |  | $ | 44,080 |
Change in the components of accumulated other comprehensive income | Change in the components of accumulated other comprehensive income consist of:
|  | Pension Benefit |  |  | Postretirement Benefit |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Balance at beginning of period |  | $ | (24,049,140 | ) |  | $ | (17,326,388 | ) |  | $ | 44,080 |  |  | $ | 435,543 |
Change due to availability of final actual assets and census data |  |  | — |  |  |  | — |  |  |  | (154,402 | ) |  |  | (5,157 | )
Charged to net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | 221,049 |  |  |  | 194,148 |  |  |  | (23,889 | ) |  |  | (23,888 | )
Net loss (gain) |  |  | 1,111,900 |  |  |  | 897,052 |  |  |  | (50,784 | ) |  |  | (46,380 | )
Other changes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability gains |  |  | (6,568,521 | ) |  |  | (7,813,952 | ) |  |  | (301,076 | ) |  |  | (316,038 | )
Balance at end of period |  | $ | (29,284,712 | ) |  | $ | (24,049,140 | ) |  | $ | (486,071 | ) |  | $ | 44,080 |
Schedule of assumptions used to determine projected benefit obligations for benefit plans | Assumptions used to determine the projected benefit obligations for the Company's pension benefit plans and postretirement benefit plan for the fiscal year indicated were as follows:
|  | 2012 |  |  | 2011 |
Discount rate |  |  | 3.90 | % |  |  | 4.55 | %
Expected return on plan assets |  |  | 8.0 | % |  |  | 8.0 | %
Rate of compensation increase |  |  | 3.25 | % |  |  | 3.25 | %
Projected benefit obligation and accumulated benefit obligation in excess of plan assets | Information for the under-funded pension plans with a projected benefit obligation and an accumulated benefit obligation in excess of plan assets:
|  | 2012 |  |  | 2011 |
Number of plans |  |  | 6 |  |  |  | 6 |
Projected benefit obligation |  | $ | 74,825,969 |  |  | $ | 64,709,379 |
Accumulated benefit obligation |  |  | 66,735,124 |  |  |  | 56,588,593 |
Fair value of plan assets |  |  | 54,644,608 |  |  |  | 48,897,760 |
Net amount recognized in accrued benefit liability |  |  | (20,181,361 | ) |  |  | (15,811,622 | )
Pension Benefits [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Components of the net periodic benefit cost | Components of the net periodic benefit cost of the Company's pension benefit plans were as follows:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Service cost |  | $ | 2,642,373 |  |  | $ | 2,141,306 |  |  | $ | 2,223,762 |
Interest cost |  |  | 2,868,528 |  |  |  | 2,949,672 |  |  |  | 2,908,962 |
Expected return on plan assets |  |  | (3,930,988 | ) |  |  | (3,650,282 | ) |  |  | (3,345,102 | )
Amortization of prior service cost |  |  | 221,049 |  |  |  | 194,148 |  |  |  | 204,569 |
Amortization of the net loss |  |  | 1,111,900 |  |  |  | 897,052 |  |  |  | 843,154 |
Net periodic benefit cost |  | $ | 2,912,862 |  |  | $ | 2,531,896 |  |  | $ | 2,835,345 |
Schedule of assumptions used to determine net periodic benefit cost for benefit plans | Assumptions used to determine net periodic benefit cost for the Company's pension benefit plans for the fiscal year indicated were as follows:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Discount rate |  |  | 3.90 | % |  |  | 5.35 | % |  |  | 5.85 | %
Expected return on plan assets |  |  | 8.0 | % |  |  | 8.5 | % |  |  | 8.5 | %
Rate of compensation increase |  |  | 3.25 | % |  |  | 4.25 | % |  |  | 4.25 | %
Fair values of plans assets utilizing fair value hierarchy | The fair values of the company's pension plans assets at December 29, 2012 and December 31, 2011, utilizing the fair value hierarchy discussed in Note 2, follow:
|  | December 29, 2012 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash and Equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Common/collective trust funds |  | $ | — |  |  | $ | 193,497 |  |  | $ | — |  |  | $ | 193,497 |
Equities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Eastern Company Common Stock |  |  | 3,063,132 |  |  |  | — |  |  |  | — |  |  |  | 3,063,132 |
Common/collective trust funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Large Cap (a) |  |  | — |  |  |  | 5,826,726 |  |  |  | — |  |  |  | 5,826,726 |
U.S. Small Cap (b) |  |  | — |  |  |  | 3,964,072 |  |  |  | — |  |  |  | 3,964,072 |
Concentrated Equity (c) |  |  | — |  |  |  | 4,899,023 |  |  |  | — |  |  |  | 4,899,023 |
International Large Cap with Active Currency (d) |  |  | — |  |  |  | 6,999,997 |  |  |  | — |  |  |  | 6,999,997 |
Emerging Market (e) |  |  | — |  |  |  | 3,017,350 |  |  |  | — |  |  |  | 3,017,350 |
Fixed Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common/collective trust funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intermediate Bond (f) |  |  | — |  |  |  | 14,368,745 |  |  |  | — |  |  |  | 14,368,745 |
Target Duration LDI Fixed Income Funds (g) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
· 6 Year LDI Fund |  |  | — |  |  |  | 215,604 |  |  |  | — |  |  |  | 215,604 |
· 8 Year LDI Fund |  |  | — |  |  |  | 214,968 |  |  |  | — |  |  |  | 214,968 |
· 10 Year LDI Fund |  |  | — |  |  |  | 306,535 |  |  |  | — |  |  |  | 306,535 |
· 12 Year LDI Fund |  |  | — |  |  |  | 824,342 |  |  |  | — |  |  |  | 824,342 |
· 14 Year LDI Fund |  |  | — |  |  |  | 1,087,074 |  |  |  | — |  |  |  | 1,087,074 |
· 16 Year LDI Fund |  |  | — |  |  |  | 426,544 |  |  |  | — |  |  |  | 426,544 |
Long Duration Fixed Credit (h) |  |  | — |  |  |  | 6,684,999 |  |  |  | — |  |  |  | 6,684,999 |
Insurance contracts |  |  | — |  |  |  | 2,552,000 |  |  |  | — |  |  |  | 2,552,000 |
Total |  | $ | 3,063,132 |  |  | $ | 51,581,476 |  |  | $ | — |  |  | $ | 54,644,608 |
|  | December 31, 2011 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash and Equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Common/collective trust funds |  | $ | — |  |  | $ | 5,202,216 |  |  | $ | — |  |  | $ | 5,202,216 |
Equities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Eastern Company Common Stock |  |  | 3,891,842 |  |  |  | — |  |  |  | — |  |  |  | 3,891,842 |
Common/collective trust funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Large Cap |  |  | — |  |  |  | 5,339,876 |  |  |  | — |  |  |  | 5,339,876 |
U.S. Small Cap |  |  | — |  |  |  | 3,090,711 |  |  |  | — |  |  |  | 3,090,711 |
Concentrated Equity |  |  | — |  |  |  | 3,803,417 |  |  |  | — |  |  |  | 3,803,417 |
International Large Cap with Active Currency |  |  | — |  |  |  | 6,292,803 |  |  |  | — |  |  |  | 6,292,803 |
Emerging Market |  |  | — |  |  |  | 2,175,968 |  |  |  | — |  |  |  | 2,175,968 |
Fixed Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common/collective trust funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intermediate Bond |  |  | — |  |  |  | 13,103,043 |  |  |  | — |  |  |  | 13,103,043 |
Long Duration Fixed Income (i) |  |  | — |  |  |  | 2,658,161 |  |  |  | — |  |  |  | 2,658,161 |
Long Duration Fixed Credit |  |  | — |  |  |  | 1,120,643 |  |  |  | — |  |  |  | 1,120,643 |
Insurance contracts |  |  | — |  |  |  | 2,219,080 |  |  |  | — |  |  |  | 2,219,080 |
Total |  | $ | 3,891,842 |  |  | $ | 45,005,918 |  |  | $ | — |  |  | $ | 48,897,760 |
Equity common funds primarily hold publicly traded common stock of both U.S and international companies selected for purposes of total return and to maintain equity exposure consistent with policy allocations. Investments include commingled funds valued at unit values provided by the investment managers, which are based on the fair value of the underlying publicly traded securities.
(a) | The investment objective of the large cap fund is to outperform the Russell 1000® Index. The fund is designed to provide for long-term growth of capital by utilizing a diversified group of quantitative investment strategies that seek to identify securities that have exposure to factors that the underlying advisors' research has found to be predictive of future excess returns. The advisors' portfolios are quantitatively structured to gain exposure to these predictive characteristics while minimizing unintended risk exposures.
(b) | The small cap fund has an objective to outperform the Russell 2500® Index The fund is designed to achieve consistency by combining advisors whose complementary disciplined processes employ distinct methods for identifying small capitalization U.S. stocks with strong return potential. Advisors in the fund use a wide range of criteria and disciplines in their stock selection, focusing on factors such as: undervalued or under-researched companies, special situations, emerging growth, asset plays or turnarounds.
(c) | The investment objective of the concentrated equity fund is to outperform the Russell 1000® Index. The fund is designed to achieve this by combining strategies with different payoffs over different phases of an economic and stock market cycle. To help achieve this objective, multiple advisors and strategies are employed to reduce "scenario risk." These multiple strategies are in the form of multiple investment styles (e.g., growth, market oriented, and value), multiple sub-styles, and different ways of identifying undervalued securities.
(d) | The international fund with active currency has an investment objective of outperforming the Russell Development ex-U.S. Large Cap Index Net. The fund is designed to provide the potential for long-term growth of capital by utilizing a diversified group of investment advisors that the Trustee's manager research indicates will outperform over a full market cycle. The investment advisors' portfolios are combined to form a fund that emphasizes their strengths while minimizing unintended risk exposures
(e) | The emerging market fund seeks to outperform the Russell Emerging Markets Index Net. The fund is designed to provide the potential for long-term growth of capital by utilizing a diversified market group of investment advisors that the Trustee's manager research indicates will outperform over a full market cycle. The investment advisors' portfolios are combined to form a fund that emphasizes their strengths while minimizing unintended risk exposures.
All equity funds have an objective to beat their respective indices with above-average consistency while maintaining volatility and diversification similar to the index they are being compared to over a full market cycle. Fixed income common funds primarily hold government and corporate debt securities selected for purposes of total return and managing fixed income exposure to policy allocations. Investments include fixed commingled funds valued at unit values provided by the investment managers, which are based on the fair value of the underlying publicly traded securities.
(f) | Fixed income common fund investments have an investment objective of outperforming the Barclays Capital U.S. Aggregate Bond Index over a full market cycle. The fund is designed to provide current income, and as a secondary objective, capital appreciation through a variety of diversified strategies including sector rotation, modest interest rate timing, security selection and tactical use of high yield and emerging market bonds. The portfolio diversification provides protection against a single security or class of securities having a disproportionate impact on aggregate performance. To help achieve the objective, the fund is actively managed by multiple advisors who use a variety of investment strategies to create a broad market exposure. The fund's advisors have distinct but complementary investment styles. These advisors generally have similar universes of investable securities but have different areas of specialization and expertise within intermediate duration securities.
(g) | The Target Duration LDI Fixed Income Funds seek to outperform their respective Barclays-Russell LDI Indexes over a full market cycle. These Funds seek to provide current income, and as a secondary objective, capital appreciation through diversified strategies including sector rotation, modest interest rate timing, security selection and tactical use of high yield and emerging market bonds. The Funds will generally be used in combination with other bond funds to enable the plans to gain additional credit exposure within their asset portfolio, with the goal of reducing the mismatch between a plan's assets and liabilities.
(h) | The long duration fixed credit fund seeks to outperform the Barclays Capital Long Credit Index over a full market cycle. The fund seeks to provide current income, and as a secondary objective, capital appreciation through diversified strategies including sector rotation, modest interest rate timing, security selection and tactical use of high yield and emerging market bonds. The fund will generally be used in combination with other bond funds, with the goal of reducing the mismatch between a plan's assets and liabilities.
(i) | The long duration fixed income fund seeks to outperform the Barclays Capital U.S. Long Government/Credit Index over a full market cycle. This fund is designed to provide current income, and as a secondary objective, capital appreciation through diversified strategies including sector rotation, modest interest rate timing, security selection and tactical use of high yield and emerging market bonds. The fund will generally be used in combination with other bond funds, with the goal of reducing the mismatch between a plan's assets and liabilities. In 2012, this fund was replaced by the Target Duration LDI Fixed Income Funds. See (g) above.
Postretirement Benefits [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Components of the net periodic benefit cost | Components of the net periodic benefit cost of the Company's postretirement benefit plan were as follows:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Service cost |  | $ | 173,613 |  |  | $ | 126,464 |  |  | $ | 110,786 |
Interest cost |  |  | 143,388 |  |  |  | 136,752 |  |  |  | 134,977 |
Expected return on plan assets |  |  | (46,255 | ) |  |  | (52,920 | ) |  |  | (59,327 | )
Amortization of prior service cost |  |  | (23,889 | ) |  |  | (23,888 | ) |  |  | (23,888 | )
Amortization of the net loss |  |  | (50,784 | ) |  |  | (46,380 | ) |  |  | (52,650 | )
Net periodic benefit cost |  | $ | 196,073 |  |  | $ | 140,028 |  |  | $ | 109,898 |
Schedule of assumptions used to determine net periodic benefit cost for benefit plans | Assumptions used to determine net periodic benefit cost for the Company's postretirement plan for the fiscal year indicated were as follows:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Discount rate |  |  | 3.90 | % |  |  | 5.35 | % |  |  | 5.85 | %
Expected return on plan assets |  |  | 8.0 | % |  |  | 8.5 | % |  |  | 8.5 | %
Fair values of plans assets utilizing fair value hierarchy | The fair values of the Company's postretirement plan assets at December 29, 2012 and December 31, 2011, utilizing the fair value hierarchy discussed in Note 2, follow:
| December 29, 2012 |
| Level 1 |  | Level 2 |  | Level 3 |  | Total |
Fixed Income: |  |  |  |  |  |  |  |  |  |  |  |
Insurance contracts |  | $ | — |  |  | $ | — |  |  | $ | 1,204,779 |  |  | $ | 1,204,779 |
Total |  | $ | — |  |  | $ | — |  |  | $ | 1,204,779 |  |  | $ | 1,204,779 |
| December 31, 2011 |
| Level 1 |  | Level 2 |  | Level 3 |  | Total |
Fixed Income: |  |  |  |  |  |  |  |  |  |  |  |
Insurance contracts |  | $ | — |  |  | $ | — |  |  | $ | 1,215,998 |  |  | $ | 1,215,998 |
Total |  | $ | — |  |  | $ | — |  |  | $ | 1,215,998 |  |  | $ | 1,215,998 |
Analysis of the Level 3 assets of the Company's postretirement plan | An analysis of the Level 3 assets of the Company's postretirement plan is as follows:
|  | 2012 |  |  | 2011 |
Fair value of Level 3 assets at beginning of year |  | $ | 1,215,998 |  |  | $ | 1,168,235 |
Change due to availability of final actual assets and census data |  |  | (3,005 | ) |  |  | (5,157 | )
Actual return on plan assets |  |  | 46,255 |  |  |  | 52,920 |
Employer contributions |  |  | 71,655 |  |  |  | 139,705 |
Benefits paid |  |  | (126,124 | ) |  |  | (139,705 | )
Fair value of Level 3 assets at end of year |  | $ | 1,204,779 |  |  | $ | 1,215,998 |
Effect of one-percentage-point change in assumed health care cost trend rates | A one-percentage-point change in assumed health care cost trend rates would have the following effects on the postretirement benefit plan:
| 1-Percentage Point
| Increase |  | Decrease
Effect on total of service and interest cost components |  | $ | 56,711 |  |  | $ | (45,651 | )
Effect on postretirement benefit obligation |  | $ | 598,791 |  |  | $ | (487,508 | )

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- Definition Tabular disclosure of benefit obligations including accumulated benefit obligation and projected benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in defined benefit plan assets within level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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