Entity tax identification number Entity Tax Identification Number Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual Funds Mutual Fund [Member] Total Fully Corrected Under VFCP and Prohibited Transaction Exemption 2002-51 EBP, Schedule of Delinquent Participant Contribution, Corrected EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Participant contribution, maximum percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Note receivable from participant, maximum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] Note receivable from participant, minimum borrowing amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Investments, at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Investment, Fair Value and NAV [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Amendment Flag Amendment Flag Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] EBP, Description of Plan and Accounting Change [Abstract] Schedule of Plan Assets Measured at Fair Value EBP, Investment, Fair Value and NAV [Table Text Block] Participant contribution, minimum percentage EBP, Participant Contribution, Pretax, Minimum Annual Compensation To Total Compensation, Percentage EBP, Participant Contribution, Pretax, Minimum Annual Compensation To Total Compensation, Percentage Par value of common stock (in dollars per share) EBP, Common Stock, Par Or Stated Value Per Share EBP, Common Stock, Par Or Stated Value Per Share Investments [Domain] Investments [Domain] EBP, Schedule of Delinquent Participant Contribution [Abstract] EBP, Nonemployer, Common Stock EBP, Nonemployer, Common Stock [Member] Use of Estimates EBP, Use of Estimate [Policy Text Block] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Company EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Schedule of Delinquent Participant Contribution [Line Items] EBP, Schedule of Delinquent Participant Contribution [Line Items] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Interest income from notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Chairman Of The EBTC Chairman Of The EBTC [Member] Chairman Of The EBTC Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Net appreciation in fair value, investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividend income, investments EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] DESCRIPTION OF PLAN EBP, Description of Plan [Text Block] Contributions Pending Correction in VFCP EBP, Schedule of Delinquent Participant Contribution, Pending Correction in VFCP EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Employer, Common Stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Title and Position [Axis] Title and Position [Axis] President, Chief Executive Officer, Chief Legal Officer And Senior Vice President President, Chief Executive Officer, Chief Legal Officer And Senior Vice President [Member] President, Chief Executive Officer, Chief Legal Officer And Senior Vice President Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Total investment and participant loans EBP, Asset Held for Investment Title and Position [Domain] Title and Position [Domain] Document Information [Line Items] Document Information [Line Items] Class of Stock [Axis] Class of Stock [Axis] Net assets available for benefits: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] Employer contribution match, percent EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Class of Stock [Domain] Class of Stock [Domain] Contributions Corrected Outside Voluntary Fiduciary Correction Program ("VFCP") EBP, Schedule of Delinquent Participant Contribution, Corrected Outside VFCP EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase in assets available for benefits EBP, Change in Net Asset Available for Benefit, Increase (Decrease) RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Investments, sold EBP, Investment Sold, Excluding Plan Interest in Master Trust, Cost Payment of benefits EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant EBP, Schedule Of Delinquent Participant Contribution, Transferred Late To Plan EBP, Schedule of Delinquent Participant Contribution, Transferred Late to Plan Current value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] BellRing Common Stock BellRing Common Stock [Member] BellRing Common Stock EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] Common Stock Funds EBP, Employer, Common Stock Fund [Member] Old BellRing Class A Common Stock Old BellRing Class A Common Stock [Member] Old BellRing Class A Common Stock Participant Loans EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation EBP, Investment [Policy Text Block] Document Type Document Type Entity Central Index Key Entity Central Index Key Participant loan interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Collective Trusts Common Collective Trust [Member] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Plan modification, officers with authority to amend, threshold EBP, Plan Modification, Delegated Authority To Amend, Increased Liability Threshold EBP, Plan Modification, Delegated Authority To Amend, Increased Liability Threshold Deductions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeited accounts, eligible to be restored EBP, Forfeited Nonvested Account, Eligible To Be Restored, Term EBP, Forfeited Nonvested Account, Eligible To Be Restored, Term Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Investments, purchased EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost Schedule H, Line 4a - Schedule of Delinquent Participant Contributions EBP, Schedule of Delinquent Participant Contribution [Text Block] EBP, Schedule of Delinquent Participant Contribution [Table] EBP, Schedule of Delinquent Participant Contribution [Table] Investments, cost basis of shares EBP, Investment, Excluding Plan Interest in Master Trust, Cost INCOME TAX STATUS EBP, Tax Status [Text Block] EBP 001 EBP 001 [Member] EBP 001 Note receivable from participant, maximum percentage of account EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Asset Held For Investment, Participant Loan, Basis Spread On Variable Rate EBP, Asset Held For Investment, Participant Loan, Basis Spread On Variable Rate EBP, Asset Held For Investment, Participant Loan, Basis Spread On Variable Rate Document Information [Table] Document Information [Table] Participant contribution, incremental increase percentage EBP, Participant Contribution, Pretax, Minimum Increment, Percentage EBP, Participant Contribution, Pretax, Minimum Increment, Percentage Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Requisite service period EBP, Requisite Service Period EBP, Requisite Service Period EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Contributions Not Corrected EBP, Schedule of Delinquent Participant Contribution, Not Corrected Net assets available for benefits Beginning of year End of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Vesting percentage of employer contribution EBP, Employer Contribution Vesting Percentage EBP, Employer Contribution Vesting Percentage Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeited nonvested accounts EBP, Forfeited Nonvested Account EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]