Document and Entity Information [Abstract] Document Information [Table] Legal Entity [Axis] Entity [Domain] Represents the entity's Employee Benefit Plan No. 001. E B P 001 [Member] Precision Strip Retirement and Savings Plan Document Information [Line Items] Document and Entity Information Document Type Entity Registrant Name Entity Central Index Key Amendment Flag STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Asset [Abstract] Assets EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Investments, at fair value EBP, Receivable [Abstract] Receivables: EBP, Note Receivable from Participant Notes receivable from participants EBP, Employer Contribution, Receivable Employer contribution receivable EBP, Other Receivable Other receivables EBP, Receivable Total receivables EBP, Asset Total assets EBP, Liability [Abstract] Liabilities Amount of liability to trustee in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Liability to Trustee Due to trustee, net EBP, Other Liability Other payables Other payables EBP, Liability Total liabilities EBP, Net Asset Available for Benefit Net assets available for benefits, end of year Net assets available for benefits, beginning of year Net assets available for benefits STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Total investment income EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Employer, net of forfeitures EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Rollover EBP, Change in Net Asset Available for Benefit, Increase from Contribution Total contributions, net Amount of increase in net asset available for benefit from revenue sharing program credits to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Change in Net Asset Available For Benefit, Increase From Revenue Sharing Program Credits Revenue sharing program credits EBP, Change in Net Asset Available for Benefit, Increase Total additions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses Recordkeeping and other Fidelity fees EBP, Change in Net Asset Available for Benefit, Decrease Total deductions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase DESCRIPTION OF THE PLAN EBP, Description of Plan [Table] EBP, Description of Plan [Line Items] DESCRIPTION OF THE PLAN PLAN TERMINATION EBP, Description of Plan [Text Block] DESCRIPTION OF THE PLAN SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Accounting Policy [Table] EBP, Accounting Policy [Line Items] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES No definition available. RELIANCE, INC. STOCK FUND Represents a table presenting information about investments held by the employee benefit plan, including investment types, fair values, units or shares held, and other related investment details as of the reporting date. Employee Benefit Plan, Investments [Table] Employee Benefit Plan, Investments [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Employee Benefit Plan, Investments [Line Items] RELIANCE, INC. STOCK FUND The entire disclosure of investments held by the employee benefit plan, including descriptions of investment types, investment strategies, fair value information, concentrations, risks and uncertainties, and other related investment information. Employee Benefit Plan, Investments [Text Block] RELIANCE, INC. STOCK FUND FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Line Items] FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] FAIR VALUE MEASUREMENTS RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Line Items] RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS INCOME TAX STATUS EBP, Tax Status [Table] EBP, Tax Status [Line Items] INCOME TAX STATUS EBP, Tax Status [Text Block] INCOME TAX STATUS No definition available. PLAN TERMINATION EBP, Plan Termination [Text Block] PLAN TERMINATION RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Line Items] SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Basis of Accounting [Policy Text Block] Basis of Presentation EBP, Investment [Policy Text Block] Investment Valuation and Income Recognition Represents the accounting policy disclosure describing how the employee benefit plan recognizes and measures net appreciation or depreciation in the fair value of investments, including realized gains and losses from investment sales and unrealized changes in the fair value of investments held during the reporting period. Employee Benefit Plan, Net Appreciation (Depreciation) in Fair Value of Investments [Policy Text Block] Net Appreciation (Depreciation) in Fair Value of Investments EBP, Risk and Uncertainty [Policy Text Block] Risks and Uncertainties EBP, Use of Estimate [Policy Text Block] Use of Estimates EBP, Payment to Participant [Policy Text Block] Benefit Payments EBP, Subsequent Event [Policy Text Block] Subsequent Events Represents a table text block used to disclose detailed information about vesting percentage into the employee benefit plan during the reporting period. Employee Benefit Plan Vesting Percentage [Table Text Block] Schedule of vesting percentage of employee benefit plan Represents tabular disclosure of investments held by the employee benefit plan, including investment categories, units or shares held, fair values, and other related investment information presented in table format. Employee Benefit Plan, Investments [Table Text Block] Schedule of assets and liabilities of the Reliance, Inc. Stock Fund EBP, Investment, Fair Value and NAV [Table Text Block] Schedule of plan's investment assets at fair value EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] Reconciliations of net assets and changes in net assets available for benefits as reported on Form 5500 with that reported in the accompanying financial statements Information by years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service [Axis] Employee Benefit Plan, Years of Vesting Service [Axis] Years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service [Domain] Employee Benefit Plan, Years of Vesting Service [Domain] Tranche one of years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service, Tranche One [Member] Less than 2 Tranche two of years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service, Tranche Two [Member] 2 Tranche three of years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service, Tranche Three [Member] 3 Tranche four of years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service, Tranche Four [Member] 4 Tranche five of years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service, Tranche Five [Member] 5 Tranche six of years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service, Tranche Six [Member] 6 or more EBP, Description, Available [true false] Description of plan available EBP, Participant Contribution, Automatic, Deferral Rate Initial Contribution rate Percentage of automatic increase per year in pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), contributes to total pretax annual compensation. Employee Benefit Plan, Participant Contribution, Automatic Increase Per Year, Percent Increase in automatic deferral contributions, percent (as a percent) Percentage of maximum automatic salary deferral contribution rate under automatic enrollment. Employee Benefit Plan, Participant Contribution, Maximum Automatic Enrollment Contribution, Percent Maximum automatic deferral contributions, percent (as a percent) EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee contribution, percentage (as a percent) Minimum number of hours of employee service required for a participant to become eligible for discretionary profit sharing contributions under the employee benefit plan. Employee Benefit Plan, Discretionary Profit Sharing Contribution, Minimum Hours of Service Requirement Employee discretionary profit sharing contribution, hours requirement (in hours) Required period of employee service necessary for eligibility for discretionary profit sharing contributions under the employee benefit plan. Employee Benefit Plan, Discretionary Profit Sharing Contribution, Eligibility Service Period Employee discretionary profit sharing contribution, eligibility service period Represents the percentage of vesting. Employee Benefit Plan, Vesting Percentage Vesting percentage (as a percent) Statistical Measurement [Axis] Statistical Measurement [Domain] Minimum [Member] Minimum Maximum [Member] Maximum Amount during the reporting period in forfeited nonvested participant account balances available for future allocation, restoration, or reduction of employer contributions and administrative expenses. Employee Benefit Plan Forfeited Nonvested Account During Period Amount of forfeited nonvested contributions during the period EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Amount of forfeited nonvested contributions used to offset employer contributions EBP, Forfeited Nonvested Account Forfeited non-vested accounts EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Note receivable, maximum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Note receivable, maximum borrowing percentage of account balance (as a percent) Maximum repayment period permitted for participant general purpose loans under the employee benefit plan. Employee Benefit Plan, Participant Loan, General Purpose, Maximum Repayment Term General purpose loan, maximum repayment term Maximum repayment period permitted for participant loans used for the purchase of a primary residence under the employee benefit plan. Employee Benefit Plan, Participant Loan, Primary Residence, Maximum Repayment Term Primary residence loan, maximum repayment term EBP, Asset Held for Investment, Participant Loan, Interest Rate Loan interest rate (as a percent) EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment Interest income from Fidelity Amount of administrative expenses of the employee benefit plan offset through the application of suspense account balances and related interest earnings during the reporting period. Employe Benefit Plan, Administrative Expenses Offset by Suspense Account Administrative expenses offset by suspense account Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] EBP, Employer, Common Stock Fund [Member] Reliance, Inc. stock fund Represents the number of units held in a unitized employer stock fund within an employee benefit plan at the reporting date. Employee Benefit Plan, Employer Stock Fund Units Held Number of shares in investment EBP, Investment, Excluding Plan Interest in Master Trust, Fair and Contract Value Interest-bearing cash Represents the total fair value of a unitized employer stock fund held by the employee benefit plan, including underlying employer common stock and related cash or liquidity components. Employee Benefit Plan, Employer Stock Fund Fair Value Fair value of the investment EBP, Investment, Number of Shares Number of shares Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value Measured at Net Asset Value Per Share [Member] Fair value at NAV Cash and Cash Equivalents [Member] Cash and cash equivalents Mutual Fund [Member] Mutual funds EBP, Employer, Common Stock [Member] Reliance, Inc. common stock EBP, Self-Directed Brokerage Account [Member] Self-directed brokerage accounts EBP, Pooled Separate Account [Member] Commingled funds Common Collective Trust [Member] Common collective trust EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Dividend on investment from Reliance, Inc. EBP, Tax Determination Letter, Obtained [true false] Determination letter obtained EBP, Tax Determination Letter, Date Determination letter date EBP, Tax Qualification Status [Extensible Enumeration] Tax qualification status Represents the percentage of vesting of participant accounts in the event of termination. Employee Benefit Plan, Vesting Percentage in Event of Termination Participant vesting percentage upon Plan termination EBP, Form 5500 Caption, Net Assets Net assets available for benefits as reported on the Form 5500 EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Contract Value to Current Value Adjustment Adjustment from fair market value per Trustee to NAV for the MIP EBP, Form 5500 Caption, Net Income (Loss) Net income as reported on the Form 5500 Amount of beginning period increase (decrease) in net asset available for benefit from current value in excess of (less than) contract value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) to reconcile change in net asset available for benefit per financial statement to Form 5500 caption. Form 5500 is form provided by Department of the Treasury, Internal Revenue Service (IRS); Department of Labor (DOL), Employee Benefit Security Administration (EBSA); and Pension Benefit Guaranty Corporation (PBGC). Employee Benefit Plan Reconciliation To Form 5500 Change In Net Asset Available For Benefit Increase Decrease For Contract Value To Current Value Beginning Of Period Investment, Adjustment from fair market value per Trustee to NAV for the MIP - Beginning of year Amount of ending period increase (decrease) in net asset available for benefit from current value in excess of (less than) contract value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) to reconcile change in net asset available for benefit per financial statement to Form 5500 caption. Form 5500 is form provided by Department of the Treasury, Internal Revenue Service (IRS); Department of Labor (DOL), Employee Benefit Security Administration (EBSA); and Pension Benefit Guaranty Corporation (PBGC). Employee Benefit Plan Reconciliation To Form 5500 Change In Net Asset Available For Benefit Increase Decrease For Contract Value To Current Value End Of Period Investment, Adjustment from fair market value per Trustee to NAV for the MIP - End of year Investment, Identifier [Axis] Entity Tax Identification Number Entity tax identification number EBP, Plan Number Plan number EBP, Investment, Issuer Name [Extensible Enumeration] Investment issuer name EBP, Investment, Current Value, Type [Extensible Enumeration] Investment type EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current Value EBP, Asset Held for Investment, Participant Loan, Maturity Date Participants loans latest maturity date EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Participant loans EBP, Asset Held for Investment Total EBP, Asset Held for Investment, Party-in-Interest [true false] Investment party in interest EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Investments participation status