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Income Taxes Income Tax Rate Reconciliation (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 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% 21.00% 21.00%
Adjustments to reconcile to the effective tax rate:        
State income taxes, net of federal benefit 3.60% 4.20% 3.60% 4.20%
Valuation allowance adjustment related to stock compensation (0.30%) (0.60%) 0.20% (0.20%)
Tax benefits from stock compensation 0.00% (0.30%) (0.20%) (0.20%)
Tax credits (1.30%) (1.10%) (1.30%) (1.10%)
Effective Income Tax Rate Reconciliation, GILTI, percent 0.80% 0.60% 0.80% 0.60%
Other 0.70% 2.10% 0.90% 1.70%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent (1.40%) (0.30%) (1.40%) (0.30%)