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Income Taxes Income Tax Rate Reconciliation (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00% 21.00%
Adjustments to reconcile to the effective tax rate:        
State income taxes, net of federal benefit 3.40% 3.60% 3.40% 3.60%
Valuation allowance adjustment related to stock compensation 0.00% (0.30%) (0.20%) 0.20%
Tax benefits from stock compensation 0.00% 0.00% 0.30% (0.20%)
Tax credits (1.50%) (1.30%) (1.50%) (1.30%)
Effective Income Tax Rate Reconciliation, GILTI, percent 0.80% 0.80% 0.80% 0.80%
Other 1.20% 0.70% 0.90% 0.90%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent (1.60%) (1.40%) (1.60%) (1.40%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent 0.60% 0.00% 0.60% 0.00%
Effective income tax rate 23.90% 23.10% 23.70% 23.60%