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Income Taxes
6 Months Ended
Mar. 31, 2023
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 endedSix months ended
March 31,March 31,
2023202220232022
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 benefit3.4 3.6 3.4 3.6 
Excess tax benefits related to stock-based compensation— — 0.3 (0.2)
Tax credits(1.5)(1.3)(1.5)(1.3)
Global Intangible Low-Taxed Income0.8 0.8 0.8 0.8 
Foreign income tax rate differential(1.6)(1.4)(1.6)(1.4)
Nondeductible compensation0.6 — 0.6 — 
Valuation allowances— (0.3)(0.2)0.2 
Other1.2 0.7 0.9 0.9 
Effective income tax rate23.9 %23.1 %23.7 %23.6 %

At March 31, 2023 and September 30, 2022, the gross liabilities for unrecognized income tax benefits were $4.9 million and $4.7 million, respectively, and are included in Other noncurrent liabilities.
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 endedSix months ended
March 31,March 31,
2023202220232022
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 benefit3.4 3.6 3.4 3.6 
Excess tax benefits related to stock-based compensation— — 0.3 (0.2)
Tax credits(1.5)(1.3)(1.5)(1.3)
Global Intangible Low-Taxed Income0.8 0.8 0.8 0.8 
Foreign income tax rate differential(1.6)(1.4)(1.6)(1.4)
Nondeductible compensation0.6 — 0.6 — 
Valuation allowances— (0.3)(0.2)0.2 
Other1.2 0.7 0.9 0.9 
Effective income tax rate23.9 %23.1 %23.7 %23.6 %