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Income Taxes
 9 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block] Income Taxes
The reconciliation between the U.S. federal statutory income tax rate and the effective income tax rate is presented below.

 Three months endedNine months ended
June 30,June 30,
2022202120222021
U.S. federal statutory income tax rate21.0 %21.0 %21.0 %21.0 %
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit3.3 4.2 3.3 4.2 
Excess tax benefits related to stock-based compensation— — (0.3)(0.3)
Tax credits(3.0)(1.7)(3.0)(1.7)
Global Intangible Low-Taxed Income1.1 0.5 1.1 0.5 
Foreign income tax rate differential(1.7)(0.4)(1.7)(0.4)
Nondeductible compensation0.9 0.6 0.9 0.6 
Basis difference in foreign investment(0.1)1.2 (0.1)1.2 
Valuation allowances— — 0.3 0.7 
Other(0.4)2.6 1.2 0.5 
Effective income tax rate21.1 %28.0 %22.7 %26.3 %
At June 30, 2022 and September 30, 2021, the gross liabilities for unrecognized income tax benefits were $4.9 million
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The reconciliation between the U.S. federal statutory income tax rate and the effective income tax rate is presented below.

 Three months endedNine months ended
June 30,June 30,
2022202120222021
U.S. federal statutory income tax rate21.0 %21.0 %21.0 %21.0 %
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit3.3 4.2 3.3 4.2 
Excess tax benefits related to stock-based compensation— — (0.3)(0.3)
Tax credits(3.0)(1.7)(3.0)(1.7)
Global Intangible Low-Taxed Income1.1 0.5 1.1 0.5 
Foreign income tax rate differential(1.7)(0.4)(1.7)(0.4)
Nondeductible compensation0.9 0.6 0.9 0.6 
Basis difference in foreign investment(0.1)1.2 (0.1)1.2 
Valuation allowances— — 0.3 0.7 
Other(0.4)2.6 1.2 0.5 
Effective income tax rate21.1 %28.0 %22.7 %26.3 %