Income Taxes (Notes)	6 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income taxes	INCOME TAXESAt both March 31, 2021 and 2020, BellRing Inc. held 28.8% of the economic interest in BellRing LLC (see Note 1), which, as a result of the IPO and formation transactions, is treated as a partnership for U.S. federal income tax purposes. As a partnership, BellRing LLC itself is generally not subject to U.S. federal income tax under current U.S. tax laws.The effective income tax rate was 10.7% and 6.3% for the three and six months ended March 31, 2021, respectively, and 10.6% and 13.8% for the three and six months ended March 31, 2020, respectively. The decrease in the effective income tax rate for the six months ended March 31, 2021 compared to the prior year period was primarily due to the Company taking into account for U.S. federal, state and local income tax purposes its 28.8% distributive share of the items of income, gain, loss and deduction of BellRing LLC in the period subsequent to the IPO. Prior to the IPO and formation transactions, the Company reported 100% of the income, gain, loss and deduction of BellRing LLC.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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