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Income Taxes Rate Reconciliation (Tables)
3 Months Ended
Dec. 31, 2024
Income Tax Disclosure [Abstract]  
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 %