v3.25.1
Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Operating Loss Carryforwards [Line Items]          
Effective income tax rate reconciliation (in percent) 28.30% 29.00% 27.90% 24.80%  
Tax receivable agreement liability $ 40.8   $ 40.8   $ 40.6
Percentage of net cash savings     85.00%    
Deferred Tax Assets, Operating Loss Carryforwards, Domestic         0.9
Tax Credit Carryforward, Amount         3.7
Deferred Tax Asset, Interest Carryforward         0.9
Domestic Tax Jurisdiction          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards         4.3
State and Local Jurisdiction          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards         $ 0.3