XML 64 R48.htm IDEA: XBRL DOCUMENT
v3.25.3

Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Accounting Policies [Abstract] |  |
Trade promotion allowance, current | $ 48.6 | $ 38.8

X
- Definition Trade promotion allowance, current + References No definition available. + Details
Name: | brbr_TradePromotionAllowanceCurrent
Namespace Prefix: | brbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration