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Income Taxes Income Tax Rate Reconciliation (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 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 3.30% 4.20% 3.30% 4.20%
Valuation allowance adjustment related to stock compensation 0.00% 0.00% 0.30% 0.70%
Tax benefits from stock compensation 0.00% 0.00% (0.30%) (0.30%)
Tax credits (3.00%) (1.70%) (3.00%) (1.70%)
Effective Income Tax Rate Reconciliation, GILTI, percent 1.10% 0.50% 1.10% 0.50%
Other (0.40%) 2.60% 1.20% 0.50%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent (1.70%) (0.40%) (1.70%) (0.40%)