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Income Taxes
 3 Months Ended
Dec. 31, 2024
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 ended
December 31,
20242023
U.S. federal statutory income tax rate21.0 %21.0 %
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit3.9 3.0 
Excess tax (benefit) deficit related to stock-based compensation(3.5)0.8 
Tax credits(1.3)(2.7)
Global Intangible Low-Taxed Income0.6 1.3 
Foreign income tax rate differential(0.7)(1.8)
Nondeductible compensation1.1 1.4 
Uncertain tax positions0.7 (8.8)
Valuation allowances— 0.4 
Other1.1 0.8 
Effective income tax rate22.9 %15.4 %

At December 31, 2024 and September 30, 2024, the gross liabilities for unrecognized income tax benefits were $3.4 million and $3.0 million, respectively, and are included in Other noncurrent liabilities.

During the three months ended December 31, 2023, we recorded $1.6 million in income tax benefits due to the release of an uncertain tax position that expired on December 31, 2023. During the three months ended December 31, 2024 and 2023, there were no material changes to other uncertain tax positions.
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 ended
December 31,
20242023
U.S. federal statutory income tax rate21.0 %21.0 %
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit3.9 3.0 
Excess tax (benefit) deficit related to stock-based compensation(3.5)0.8 
Tax credits(1.3)(2.7)
Global Intangible Low-Taxed Income0.6 1.3 
Foreign income tax rate differential(0.7)(1.8)
Nondeductible compensation1.1 1.4 
Uncertain tax positions0.7 (8.8)
Valuation allowances— 0.4 
Other1.1 0.8 
Effective income tax rate22.9 %15.4 %