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Income Taxes
 9 Months Ended
Jun. 30, 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 endedNine months ended
June 30,June 30,
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 benefit3.5 3.2 3.5 3.2 
Excess tax deficit related to stock-based compensation— — — 0.2 
Tax credits(1.8)(3.5)(1.8)(2.8)
Global Intangible Low-Taxed Income(0.1)1.1 (0.1)1.1 
Foreign income tax rate differential(0.4)(2.2)(0.4)(2.2)
Nondeductible compensation1.0 0.9 1.0 0.9 
Uncertain tax positions0.4 — (0.7)— 
Valuation allowances0.7 — 0.4 — 
Other0.9 0.2 0.9 1.3 
Effective income tax rate25.2 %20.7 %23.8 %22.7 %

At June 30, 2024 and September 30, 2023, the gross liabilities for unrecognized income tax benefits were $4.1 million and $5.0 million, respectively, and are included in Other noncurrent liabilities.

During the nine months ended June 30, 2024, we recorded $1.6 million in income tax benefits due to the release of an uncertain tax position that expired on December 31, 2023. No income tax benefits or expenses were recorded during the three months ended June 30, 2024 related to this uncertain tax position.
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,
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 benefit3.5 3.2 3.5 3.2 
Excess tax deficit related to stock-based compensation— — — 0.2 
Tax credits(1.8)(3.5)(1.8)(2.8)
Global Intangible Low-Taxed Income(0.1)1.1 (0.1)1.1 
Foreign income tax rate differential(0.4)(2.2)(0.4)(2.2)
Nondeductible compensation1.0 0.9 1.0 0.9 
Uncertain tax positions0.4 — (0.7)— 
Valuation allowances0.7 — 0.4 — 
Other0.9 0.2 0.9 1.3 
Effective income tax rate25.2 %20.7 %23.8 %22.7 %