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Income Taxes Income Tax Rate Reconciliation (Details)
3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Adjustments to reconcile to the effective tax rate:    
State income taxes, net of federal benefit 3.40% 3.90%
Valuation allowance adjustment related to stock compensation (0.20%) 1.40%
Tax benefits from stock compensation 0.70% (1.00%)
Tax credits (1.60%) (1.20%)
Effective Income Tax Rate Reconciliation, GILTI, percent 0.80% 0.30%
Other 0.50% 0.50%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent (1.60%) (0.70%)