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Income Taxes Rate Reconciliation (Tables)
9 Months Ended
Jun. 30, 2025
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 endedNine months ended
June 30,June 30,
2025202420252024
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 benefit4.0 3.5 4.0 3.5 
Excess tax benefit related to stock-based compensation— — (1.2)— 
Tax credits(1.4)(1.8)(1.4)(1.8)
Global Intangible Low-Taxed Income0.3 (0.1)0.3 (0.1)
Foreign income tax rate differential(0.6)(0.4)(0.6)(0.4)
Nondeductible compensation1.5 1.0 1.5 1.0 
Uncertain tax positions0.3 0.4 0.3 (0.7)
Valuation allowances0.4 0.7 0.4 0.4 
Other1.6 0.9 0.7 0.9 
Effective income tax rate27.1 %25.2 %25.0 %23.8 %