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Stock-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
PHI Stock Options      
Share-based Payment Award [Line Items]      
Stock options outstanding, beginning balance 38,314    
Stock options granted in period 0    
Impact of Spin-off 18,498    
Stock options exercised in period 0    
Stock options forfeited in period 0    
Stock options expired in period 0    
Stock options outstanding, ending balance 56,812 38,314  
Stock options vested and expected to vest 56,812    
Stock options exercisable 56,812    
Stock options outstanding, weighted average exercise price $ 54.91 $ 81.42  
Stock options granted in period, weighted average exercise price 0    
Impact of Spin-off, Weighted Average Exercise Price 54.91    
Stock options exercised in period, weighted average exercise price 0    
Stock options forfeited in period, weighted average exercise price 0    
Stock options expired in period, weighted average exercise price 0    
Stock options vested and expected to vest, weighted average exercise price 54.91    
Stock options exercisable in period, weighted average exercise price $ 54.91    
Stock options outstanding, weighted average remaining contractual term 5 years 2 months 15 days    
Stock options vested and expected to vest, weighted average remaining contractual term 5 years 2 months 15 days    
Stock options exercisable, weighted average remaining contractual term 5 years 2 months 15 days    
Stock options outstanding, intrinsic value $ 1.5    
Stock options vested and expected to vest, intrinsic value 1.5    
Stock options exercisable, intrinsic value $ 1.5    
BRBR Stock Options      
Share-based Payment Award [Line Items]      
Stock options outstanding, beginning balance 258,969    
Stock options granted in period 0    
Impact of Spin-off 27,074    
Stock options exercised in period (27,056)    
Stock options forfeited in period 0    
Stock options expired in period 0    
Stock options outstanding, ending balance 258,987 258,969  
Stock options vested and expected to vest 258,987    
Stock options exercisable 91,266    
Stock options outstanding, weighted average exercise price $ 17.74 $ 19.78  
Stock options granted in period, weighted average exercise price 0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Impact of Spin-off 17.74    
Stock options exercised in period, weighted average exercise price 19.50    
Stock options forfeited in period, weighted average exercise price 0    
Stock options expired in period, weighted average exercise price 0    
Stock options vested and expected to vest, weighted average exercise price 17.74    
Stock options exercisable in period, weighted average exercise price $ 17.63    
Stock options outstanding, weighted average remaining contractual term 7 years 9 months 18 days    
Stock options vested and expected to vest, weighted average remaining contractual term 7 years 9 months 18 days    
Stock options exercisable, weighted average remaining contractual term 7 years 7 months 24 days    
Stock options outstanding, intrinsic value $ 0.7    
Stock options vested and expected to vest, intrinsic value 0.7    
Stock options exercisable, intrinsic value 0.3    
Stock options, expected term   6 years 6 months 6 years 6 months
Stock options, expected volatility rate   38.50% 38.50%
Stock options, risk free interest rate   0.60% 1.60%
Stock options, expected dividend rate   0.00% 0.00%
Stock options, weighted average grant date fair value   $ 7.79 $ 7.92
Stock options, exercises in period, intrinsic value 0.1    
Proceeds from exercises of stock awards $ 0.5