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Income Taxes Rate Reconciliation (Tables)
6 Months Ended
Mar. 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 endedSix months ended
March 31,March 31,
2024202320242023
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 3.4 3.4 3.4 
Excess tax deficit related to stock-based compensation— — 0.1 0.3 
Tax credits(2.1)(1.5)(2.1)(1.5)
Global Intangible Low-Taxed Income0.2 0.8 0.2 0.8 
Foreign income tax rate differential(0.8)(1.6)(0.8)(1.6)
Nondeductible compensation1.0 0.6 1.0 0.6 
Uncertain tax positions0.5 — (1.6)— 
Valuation allowances— — — (0.2)
Other1.6 1.2 1.5 0.9 
Effective income tax rate24.8 %23.9 %22.7 %23.7 %