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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Income Tax Disclosure [Abstract]          
Unrecognized Tax Benefits $ 5.3   $ 5.3   $ 4.7
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00% 21.00%  
State income taxes, net of federal benefit 3.20% 3.30% 3.20% 3.30%  
Tax credits (3.50%) (3.00%) (2.80%) (3.00%)  
Other 0.20% (0.40%) 1.30% 1.20%