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Income Taxes

9 Months Ended

Jun. 30, 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												Nine months ended
			June 30,												June 30,
			2023						2022						2023						2022
U.S. federal statutory income tax rate			21.0		%				21.0		%				21.0		%				21.0		%
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit			3.2						3.3						3.2						3.3
Excess tax benefits related to stock-based compensation			—						—						0.2						(0.3)
Tax credits			(3.5)						(3.0)						(2.8)						(3.0)
Global Intangible Low-Taxed Income			1.1						1.1						1.1						1.1
Foreign income tax rate differential			(2.2)						(1.7)						(2.2)						(1.7)
Nondeductible compensation			0.9						0.9						0.9						0.9
Basis difference in foreign investment			—						(0.1)						—						(0.1)
Valuation allowances			—						—						—						0.3
Other			0.2						(0.4)						1.3						1.2
Effective income tax rate			20.7		%				21.1		%				22.7		%				22.7		%

At June 30, 2023 and September 30, 2022, the gross liabilities for unrecognized income tax benefits were $5.3 million and $4.7 million, respectively, and are included in Other noncurrent liabilities.

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												Nine months ended
			June 30,												June 30,
			2023						2022						2023						2022
U.S. federal statutory income tax rate			21.0		%				21.0		%				21.0		%				21.0		%
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit			3.2						3.3						3.2						3.3
Excess tax benefits related to stock-based compensation			—						—						0.2						(0.3)
Tax credits			(3.5)						(3.0)						(2.8)						(3.0)
Global Intangible Low-Taxed Income			1.1						1.1						1.1						1.1
Foreign income tax rate differential			(2.2)						(1.7)						(2.2)						(1.7)
Nondeductible compensation			0.9						0.9						0.9						0.9
Basis difference in foreign investment			—						(0.1)						—						(0.1)
Valuation allowances			—						—						—						0.3
Other			0.2						(0.4)						1.3						1.2
Effective income tax rate			20.7		%				21.1		%				22.7		%				22.7		%

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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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