DESCRIPTION OF PLAN (Details) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2022
EBP, Description of Plan [Line Items]
EBP, Asset Held For Investment, Participant Loan, Basis Spread On Variable Rate	1.00%
EBP 001
EBP, Description of Plan [Line Items]
Participant contribution, minimum percentage	1.00%
Participant contribution, maximum percentage	50.00%
Participant contribution, incremental increase percentage	1.00%
Employer contribution match, percent	6.00%
Requisite service period	1 year
Vesting percentage of employer contribution	100.00%
Note receivable from participant, minimum borrowing amount	$ 1,000
Note receivable from participant, maximum borrowing amount	$ 50,000
Note receivable from participant, maximum percentage of account	50.00%
Forfeited accounts, eligible to be restored	5 years
Forfeited nonvested accounts	$ 0
EBP 001 \| President, Chief Executive Officer, Chief Legal Officer And Senior Vice President
EBP, Description of Plan [Line Items]
Plan modification, officers with authority to amend, threshold	5,000,000
EBP 001 \| Chairman Of The EBTC
EBP, Description of Plan [Line Items]
Plan modification, officers with authority to amend, threshold	$ 15,000,000
EBP 001 \| Old BellRing Class A Common Stock
EBP, Description of Plan [Line Items]
Par value of common stock (in dollars per share)		$ 0.01
EBP 001 \| BellRing Common Stock
EBP, Description of Plan [Line Items]
Par value of common stock (in dollars per share)		$ 0.01

EBP, Asset Held For Investment, Participant Loan, Basis Spread On Variable Rate

No definition available.

Name:	brbr_EBPAssetHeldForInvestmentParticipantLoanBasisSpreadOnVariableRate
Namespace Prefix:	brbr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

EBP, Common Stock, Par Or Stated Value Per Share

+ References

No definition available.

+ Details

Name:	brbr_EBPCommonStockParOrStatedValuePerShare
Namespace Prefix:	brbr_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

EBP, Employer Contribution Vesting Percentage

+ References

No definition available.

+ Details

Name:	brbr_EBPEmployerContributionVestingPercentage
Namespace Prefix:	brbr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Forfeited Nonvested Account, Eligible To Be Restored, Term

+ References

No definition available.

+ Details

Name:	brbr_EBPForfeitedNonvestedAccountEligibleToBeRestoredTerm
Namespace Prefix:	brbr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Pretax, Minimum Annual Compensation To Total Compensation, Percentage

+ References

No definition available.

+ Details

Name:	brbr_EBPParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage
Namespace Prefix:	brbr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Pretax, Minimum Increment, Percentage

+ References

No definition available.

+ Details

Name:	brbr_EBPParticipantContributionPretaxMinimumIncrementPercentage
Namespace Prefix:	brbr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Plan Modification, Delegated Authority To Amend, Increased Liability Threshold

+ References

No definition available.

+ Details

Name:	brbr_EBPPlanModificationDelegatedAuthorityToAmendIncreasedLiabilityThreshold
Namespace Prefix:	brbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

EBP, Requisite Service Period

+ References

No definition available.

+ Details

Name:	brbr_EBPRequisiteServicePeriod
Namespace Prefix:	brbr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=brbr_EBP001Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=brbr_PresidentChiefExecutiveOfficerChiefLegalOfficerAndSeniorVicePresidentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=brbr_ChairmanOfTheEBTCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=brbr_OldBellRingClassACommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=brbr_BellRingCommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: