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RETIREMENT BENEFIT PLANS, Assumptions Used to Determine the Projected Benefit Obligations and Estimated Benefit Payments (Details) | 12 Months Ended
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Dec. 30, 2017 USD ($) Plan | Dec. 31, 2016 USD ($) Plan
Assumptions used to determine net periodic benefit obligations [Abstract] |  |
Accumulated benefit obligation for all qualified and nonqualified defined benefit pension plans | $ 98,522,201 | $ 92,258,937
Pension plans with projected benefit obligation and accumulated benefit obligation in excess of plan assets [Abstract] |  |
Number of plans | Plan | 6 | 6
Projected benefit obligation | $ 98,522,201 | $ 92,258,937
Accumulated benefit obligation | 98,522,201 | 92,258,937
Fair value of plan assets | 72,098,722 | 65,627,499
Net amount recognized in accrued benefit liability | $ (26,423,429) | (26,631,438)
Estimated future benefit payments to participants [Abstract] |  |
Period of horizon for various asset classes used in calculating expected long term rates of return | 10 years |
Pension Benefits [Member] |  |
Pension plans with projected benefit obligation and accumulated benefit obligation in excess of plan assets [Abstract] |  |
Net amount recognized in accrued benefit liability | $ 26,423,429 | $ 26,631,438
Estimated future benefit payments to participants [Abstract] |  |
2018 | 3,800,000 |
2019 | 4,100,000 |
2020 | 4,300,000 |
2021 | 4,600,000 |
2022 | 4,800,000 |
2023 through 2027 | 26,800,000 |
Contributions expected to be made by Company in next fiscal year | $ 510,000 |
Pension Benefits [Member] | Minimum [Member] |  |
Assumptions used to determine net periodic benefit obligations [Abstract] |  |
Discount rate | 3.54% | 4.04%
Pension Benefits [Member] | Maximum [Member] |  |
Assumptions used to determine net periodic benefit obligations [Abstract] |  |
Discount rate | 3.57% | 4.08%
Other Postretirement Benefits [Member] |  |
Assumptions used to determine net periodic benefit obligations [Abstract] |  |
Discount rate | 3.60% | 4.12%
Pension plans with projected benefit obligation and accumulated benefit obligation in excess of plan assets [Abstract] |  |
Net amount recognized in accrued benefit liability | $ 1,032,171 | $ 1,051,700
Estimated future benefit payments to participants [Abstract] |  |
2018 | 105,000 |
2019 | 106,000 |
2020 | 107,000 |
2021 | 109,000 |
2022 | 110,000 |
2023 through 2027 | 569,000 |
Contributions expected to be made by Company in next fiscal year | $ 105,000 |
Supplemental Pension [Member] |  |
Assumptions used to determine net periodic benefit obligations [Abstract] |  |
Discount rate | 3.10% | 3.03%

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- Definition Period of horizon for various asset classes used in calculating expected long-term rates of return. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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=82843861&loc=d3e1928-114920 + Details
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