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Stock-Based Compensation (Tables)
12 Months Ended
Sep. 30, 2021
PHI Stock Options  
Share-based Payment Award [Line Items]  
Stock options, activity
in millions, except options or where otherwise indicatedPost Stock OptionsWeighted-
Average
Exercise
Price Per Share
Weighted-
Average
Remaining
Contractual
Term in Years
Aggregate
Intrinsic
Value
Outstanding at September 30, 202038,314$81.42 
Granted— 
Exercised— 
Forfeited— 
Expired— 
Outstanding at September 30, 202138,31481.42 6.21$1.1 
Vested and expected to vest as of September 30, 202138,31481.42 6.211.1 
Exercisable at September 30, 202134,20180.14 6.101.0 
Stock options, valuation assumptions
Expected term (in years)6.5
Expected stock price volatility29.7%
Risk-free interest rate3.1%
Expected dividends—%
Fair value (per option)$33.82
PHI Stock-Settled Restricted Stock Unit  
Share-based Payment Award [Line Items]  
Restricted stock units, activity
Post RSUsWeighted-
Average
Grant Date Fair Value Per Share
Nonvested at September 30, 202059,760 $99.83 
Granted— — 
Vested(34,151)96.32 
Forfeited(4,493)105.70 
Nonvested at September 30, 202121,116 104.26 
PHI Cash-Settled Restricted Stock Unit  
Share-based Payment Award [Line Items]  
Restricted stock units, activity
Post Cash RSUsWeighted- Average Grant Date Fair Value Per Share
Nonvested at September 30, 20204,000 $51.43 
Granted— — 
Vested(1,000)51.43 
Forfeited— — 
Nonvested at September 30, 20213,000 51.43 
BRBR Stock Options  
Share-based Payment Award [Line Items]  
Stock options, activity
in millions, except options or where otherwise indicatedBellRing Stock OptionsWeighted-
Average
Exercise
Price Per Share
Weighted-
Average
Remaining
Contractual
Term in Years
Aggregate
Intrinsic
Value
Outstanding at September 30, 202096,000$19.31 
Granted162,96920.05 
Exercised— 
Forfeited— 
Expired— 
Outstanding at September 30, 2021258,96919.78 8.76$2.8 
Vested and expected to vest as of September 30, 2021258,96919.78 8.762.8 
Exercisable at September 30, 202132,00019.31 8.150.4 
Stock options, valuation assumptions
September 30,
20212020
Expected term (in years)6.56.5
Expected stock price volatility38.5%38.5%
Risk-free interest rate0.6%1.6%
Expected dividends—%—%
Fair value (per option)$7.79$7.92
BRBR Stock-Settled Restricted Stock Units  
Share-based Payment Award [Line Items]  
Restricted stock units, activity
BellRing RSUsWeighted-
Average
Grant Date Fair Value Per Share
Nonvested at September 30, 2020385,232 $19.39 
Granted261,808 20.34 
Vested(138,122)19.61 
Forfeited(41,255)19.47 
Nonvested at September 30, 2021467,663 19.85