75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - EMPLOYEE BENEFIT PLAN, STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - EMPLOYEE BENEFIT PLAN, STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS link:presentationLink link:calculationLink link:definitionLink 75030 - Disclosure - DESCRIPTION OF PLAN link:presentationLink link:calculationLink link:definitionLink 75040 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 75050 - Disclosure - RISKS AND UNCERTAINTIES link:presentationLink link:calculationLink link:definitionLink 75060 - Disclosure - PLAN TERMINATION link:presentationLink link:calculationLink link:definitionLink 75070 - Disclosure - TAX STATUS link:presentationLink link:calculationLink link:definitionLink 75080 - Disclosure - NEW YORK LIFE STABLE VALUE FUND link:presentationLink link:calculationLink link:definitionLink 75090 - Disclosure - FAIR VALUE OF PLAN ASSETS link:presentationLink link:calculationLink link:definitionLink 75100 - Disclosure - PARTY-IN-INTEREST TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 75110 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 75120 - Disclosure - SCHEDULE OF ASSETS (HELD AT END OF YEAR) link:presentationLink link:calculationLink link:definitionLink 75130 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 75140 - Disclosure - FAIR VALUE OF PLAN ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 75150 - Disclosure - DESCRIPTION OF PLAN (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 75160 - Disclosure - TAX STATUS (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 75170 - Disclosure - FAIR VALUE OF PLAN ASSETS - Assets Measured at Fair Value on a Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 75180 - Disclosure - PARTY-IN-INTEREST TRANSACTIONS (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 75190 - Disclosure - SUBSEQUENT EVENTS (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 75200 - Disclosure - SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) link:presentationLink link:calculationLink link:definitionLink 75200 - Disclosure - SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) [Default] link:presentationLink link:calculationLink link:definitionLink EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions to net assets attributed to: Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid to participants EBP, Trustee [Member] International Brotherhood of Electrical Workers [Member] International Brotherhood of Electrical Workers Fair Value, Inputs, Level 2 [Member] Significant Other Observable Inputs (Level 2) EBP, Related Party and Party-in-Interest Transactions [Line Items] Employee Benefit Plan Number of Loans Employee Benefit Plan Number of Loans Employee benefit plan, number of loans Document Fiscal Period Focus EBP, Tax Status [Abstract] EBP, Description of Plan [Text Block] DESCRIPTION OF PLAN EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest on notes receivable from participants Investment, Identifier [Axis] Employee Benefit Plan Stock Fund Common Stock Percentage Employee Benefit Plan Stock Fund Common Stock Percentage Employee benefit plan, stock fund common stock percentage EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative fees Administrative fees Administrative fees EBP, Description of Plan [Line Items] Employee Benefit Plan Loan Term EmployeeBenefitPlanLoanTerm Employee benefit plan, participants loan terms EBP, Debt, Interest Rate Employee benefit plan loan interest rate EBP, Employer Contribution, Matching Percentage Employee contribution matching percentage EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Fair Value and NAV [Abstract] Employee Benefit Plan Participant Contribution Employee Benefit Plan Participant Contribution EBP, Accounting Policy [Line Items] Employee Benefit Plan Plan Termination [Line Items] Employee Benefit Plan Plan Termination [Line Items] EBP, Schedule of Asset Held for Investment [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Employee benefit plan, participants maximum borrowing amount Amendment Flag EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash, Total Employer Deductions from net assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Employee Benefit Plan, Maximum Number of Loans Employee Benefit Plan, Maximum Number of Loans Employee benefit plan, maximum number of loans EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Employee benefit plan, participants minimum borrowing amount Payment of Benefits EBP, Payment to Participant [Policy Text Block] Common Stock [Member] Common Stock [Member] EBP, Schedule of Asset Held for Investment [Line Items] Fair Value Hierarchy and NAV [Axis] EBP, Investment, Current Value, Type [Extensible Enumeration] Investment Type [Axis] EBP, Subsequent Event, Effect, Inestimable [true false] Employee Benefit Plan, Material Subsequent Event Affected or Non Affected the Plan Document Type Entity Central Index Key EBP, Investment [Policy Text Block] Investment Valuation and Income Recognition LIUNA [Member] LIUNA [Member] EBP, Contribution, Participating Employer [Axis] EBP, Subsequent Event [Table] EBP, Accounting Policy [Table] EBP, Subsequent Event [Abstract] EBP, Basis of Accounting [Policy Text Block] Basis of Accounting Employee Benefit Plan Common Stock Percentage Employee Benefit Plan Common Stock Percentage Current Fiscal Year End Date Employee benefit Plan Employee Contribution Percentage Employee benefit Plan Employee Contribution Percentage United Steel Workers [Member] United Steel Workers EBP, Description of Plan [Table] Common Stock Fund [Member] EBP, Employer, Common Stock [Member] Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment, Total EBP, Investment, Excluding Plan Interest in Master Trust, Cost EBP, Shares Value Employee Benefit Plan Cash And Cash Equivalents Percentage Employee Benefit Plan Cash And Cash Equivalents Percentage EBP, Investment, Number of Shares EBP, Number of Shares Minimum [Member] PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Change in Net Asset Available for Benefit, Increase Total additions Fair Value, Inputs, Level 3 [Member] Significant Unobservable Inputs (Level 3) Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Employee benefit plan, stock fund cash and cash equivalent percentage Employee Benefit Plan Stock Fund Cash and Cash Equivalent Percentage Employee Benefit Plan Stock Fund Cash and Cash Equivalent Percentage EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Employee Benefit Plan Plan Termination [Table] Employee Benefit Plan Plan Termination [Table] EBP, Expense [Policy Text Block] Expenses EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participant EBP, Investment, Acquired, Number of Investment Employee benefit plan investment portfolio Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] EBP, Tax Determination Letter, Date Determination Date EBP, Participant Contribution, Automatic, Deferral Rate Employee benefit plan participant contribution deferral rate Employee benefit plan, participant automatic contribution rate EBP, Contribution, Participating Employer [Domain] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Ending Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Beginning Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Total Total Investments at Fair Value Investments at Fair Value Management Estimates EBP, Use of Estimate [Policy Text Block] Employee Benefit Plan Participant Contribution Pretax Minimum Annual Compensation to Total Compensation Percentage Employee Benefit Plan Participant Contribution Pretax Minimum Annual Compensation to Total Compensation Percentage Employee benefit plan, participant minimum contribution percentage Mutual Fund [Member] Registered Investment Companies [Member] Entity [Domain] Primary Residence [Member] Primary Residence [Member] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] EBP, Investment, Fair Value and NAV [Text Block] FAIR VALUE OF PLAN ASSETS EBP, Description of Plan and Accounting Change [Abstract] EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Employee Benefit Plan, Current Value EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Statistical Measurement [Domain] EBP, Note Receivable from Participant Notes Receivable from Participants Document Period End Date EBP, Risk and Uncertainty [Table] Fair Value Hierarchy and NAV [Domain] EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Employee benefit plan, participants maximum borrowing percentage of vested balance EBP, Tax Determination Letter, Obtained [true false] EBP, tax determination letter, obtained EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Plan Termination [Text Block] PLAN TERMINATION Employee Benefit Plan Stable Value Fund [Table] Employee Benefit Plan Stable Value Fund [Table] SUBSEQUENT EVENTS EBP, Subsequent Event [Text Block] Cover [Abstract] Investments [Domain] Employee Benefit Plan Number of Participant EBP, Number of Participants Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] EBP, Risk and Uncertainty [Abstract] EBP, Change in Value of Stock EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Net Assets Available for Benefits EBP, Net Asset Available for Benefit Beginning of year End of year EBP, Investment, Fair Value and NAV [Table Text Block] Assets Measured at Fair Value on a Recurring Basis EBP, Net Asset Available for Benefit [Abstract] Net assets available for benefits: EBP, Schedule of Asset Held for Investment [Abstract] EBP, Debt, Maturity Date EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Employee Benefit Plan, Current Value Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] EBP, Statement of Net Asset Available for Benefit [Table] Document Fiscal Year Focus EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment, Total Net appreciation in fair value of investments EBP, Employer Contribution, Participant Compensation Matched, Percentage Employee benefit plan participant contribution match Employee benefit plan, percentage of employee compensation matched EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee benefit plan participant contribution compensation Employee benefit plan, participant maximum contribution percentage EBP, Plan Number UWUA [Member] UWUA EBP, Investment, Fair Value and NAV [Line Items] EBP In-Kind Distributions EBP In-Kind Distributions EBP In-Kind Distributions Legal Entity [Axis] EBP, Plan Name Employee Benefit Plan Stable Value Fund [Line Items] Employee Benefit Plan Stable Value Fund [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Total investment income EBP, Investment, Fair Value and NAV [Table] Participant rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Subsequent Event [Line Items] EBP, Tax Status [Text Block] TAX STATUS Maximum [Member] Statistical Measurement [Axis] Employee Benefit Plan Loan Rate in Addition to Prime Rate Employee Benefit Plan Loan Rate in Addition to Prime Rate Employee benefit plan, loan rate in addition to prime rate Employee Benefit Plan, Participant Automatic Annual Contribution Increase Percentage Employee Benefit Plan, Participant Automatic Annual Contribution Increase Percentage Employee benefit plan, participant annual contribution increase percentage EBP, Statement of Change in Net Asset Available for Benefits [Abstract] Employee Benefit Plan Stable Value Fund [Text Block] Employee Benefit Plan Stable Value Fund [Text Block] NEW YORK LIFE STABLE VALUE FUND Employee Benefit Plan Employor Contribution Percentage Employee Benefit Plan Employor Contribution Percentage Employee benefit plan, company contribution percentage Entity Registrant Name EBP, Asset Held for Investment, Participant Loan, Interest Rate Employee Benefit Plan, Percentage of Participant Loans EBP 002 [Member] EBP 002 [Member] EBP 002 [Member] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Axis] Non Union Employees [Member] Non Union Employees [Member] Non Union Employees [Member] RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Text Block] EBP, Change in Net Asset Available for Benefit, Decrease Total deductions Total deductions Rollover distributions Employee Benefit Plan Change In Net Asset Available For Benefit Decrease For Rollover distributions Employee Benefit Plan Change In Net Asset Available For Benefit Decrease For Rollover distributions Rollover distributions SCHEDULE OF ASSETS (HELD AT END OF YEAR) Employee Benefit Plan, Schedule of Assets Held at End of Year [Text Block] Employee Benefit Plan, Schedule of Assets Held at End of Year [Text Block] Fair Value, Inputs, Level 1 [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) Disclosure Text Block [Abstract] Employee Benefit Plan, Employer Contribution Percentage Employee Benefit Plan, Employer Contribution Percentage Employee benefit plan, company contribution percentage EBP, Tax Status [Line Items] Entity Tax Identification Number Utility Workers Union of America [Member] Utility Workers Union of America Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Tax Status [Table] Investments at Contract Value EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Employee benefit plan loan maturity date Employee Benefit Plan Loan Maturity Date Employee Benefit Plan Loan Maturity Date EBP, Asset Held for Investment, Party-in-Interest [true false] Principal High Yield Fund R6 [Member] Vanguard Instit Index [Member] JP Morgan Large Growth R6 [Member] Undiscovered Mgrs Behav Val R6 [Member] Amer Target 2050 Fund R6 [Member] Amer Target 2055 Fund R6 [Member] New York Life Stable Value Fund [Member] American EUPAC R6 [Member] Amer Target 2025 Fund R6 [Member] Goldman Intl SC Insights R6 [Member] American New World Fund R6 [Member] New York Life Stable Value Fund [Member] PIMCO Real Return Fund [Member] Invesco Growth & Income R6 [Member] Vanguard Total Bd Mkt Ind Adm [Member] Amer Target 2045 Fund R6 [Member] American Balanced Fund R6 [Member] Amer Target 2055 Fund R6 [Member] Amer Target 2040 Fund R6 [Member] Amer Target 2065 Fund R6 [Member] Undiscovered Mgrs Behav Val R6 [Member] Cohen & Steers Inst Realty [Member] JP Morgan US Govt MMkt Fund [Member] PGIM Jennison Small Company R6 [Member] Fid Advisor Mid Cap II Fund Z [Member] Dodge & Cox Income Fund [Member] Invesco Value Opportunities R6 [Member] Vanguard Sm Cap Index Fd Adm [Member] MFS Intntl Intrinsic Value R6 [Member] American Balanced Fund R6 [Member] Amer Target 2025 Fund R6 [Member] Amer Target 2040 Fund R6 [Member] Unitil Corp Common Stock [Member] PIMCO Real Return Fund [Member] Amer Target 2035 Fund R6 [Member] Fid Advisor Mid Cap II Fund Z [Member] Vanguard Sm Cap Index Fd Adm [Member] Unitil Corp Common Stock [Member] Principal High Yield Fund R6 [Member] Janus Henderson Enterprise (N) [Member] Amer Target 2060 Fund R6 [Member] MFS Intntl Intrinsic Value R6 [Member] The Investment Co of Amer R6 [Member] Dodge & Cox Income Fund [Member] Vanguard Mid Cap Index Adm [Member] Amer Target 2060 Fund R6 [Member] PIMCO Money Market Fund Admin [Member] Vanguard Total Int Idx Adm [Member] The Investment Co of Amer R6 [Member] Invesco Growth & Income R6 [Member] JP Morgan US Govt MMkt Fund [Member] Amer Target 2035 Fund R6 [Member] Amer Target 2030 Fund R6 [Member] PIMCO Income Fund [Member] PIMCO Income Fund [Member] Invesco Value Opportunities R6 [Member] American New World Fund R6 [Member] Loomis Sayles Core Plus Bond N [Member] Janus Henderson Enterprise (N) [Member] Cohen & Steers Inst Realty [Member] Goldman Intl SC Insights R6 [Member] Amer Target 2045 Fund R6 [Member] American EUPAC R6 [Member] Amer Target 2030 Fund R6 [Member] Vanguard Instit Index [Member] Vanguard Total Int Idx Adm [Member] Vanguard Total Bd Mkt Ind Adm [Member] JP Morgan Large Growth R6 [Member] PGIM Jennison Small Company R6 [Member] Amer Target 2020 Fund R6 [Member] PIMCO Money Market Fund Admin [Member] Amer Target 2050 Fund R6 [Member] Vanguard Mid Cap Index Adm [Member] Loomis Sayles Core Plus Bond N [Member] Amer Target 2065 Fund R6 [Member] Amer Target 2020 Fund R6 [Member]