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Income Taxes

3 Months Ended

Dec. 31, 2023

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,
			2023						2022
U.S. federal statutory income tax rate			21.0		%				21.0		%
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit			3.0						3.4
Excess tax deficit related to stock-based compensation			0.8						0.7
Tax credits			(2.7)						(1.6)
Global Intangible Low-Taxed Income			1.3						0.8
Foreign income tax rate differential			(1.8)						(1.6)
Nondeductible compensation			1.4						0.5
Uncertain tax positions			(8.8)						—
Valuation allowances			0.4						(0.2)
Other			0.8						0.5
Effective income tax rate			15.4		%				23.5		%

At December 31, 2023 and September 30, 2023, the gross liabilities for unrecognized income tax benefits were $3.7 million and $5.0 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.

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,
			2023						2022
U.S. federal statutory income tax rate			21.0		%				21.0		%
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit			3.0						3.4
Excess tax deficit related to stock-based compensation			0.8						0.7
Tax credits			(2.7)						(1.6)
Global Intangible Low-Taxed Income			1.3						0.8
Foreign income tax rate differential			(1.8)						(1.6)
Nondeductible compensation			1.4						0.5
Uncertain tax positions			(8.8)						—
Valuation allowances			0.4						(0.2)
Other			0.8						0.5
Effective income tax rate			15.4		%				23.5		%

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The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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