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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 ended |  | Nine months ended
| June 30, |  | June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
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 | 3.5 |  |  | 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 compensation | 1.0 |  |  | 0.9 |  |  | 1.0 |  |  | 0.9 |
Uncertain tax positions | 0.4 |  |  | — |  |  | (0.7) |  |  | — |
Valuation allowances | 0.7 |  |  | — |  |  | 0.4 |  |  | — |
Other | 0.9 |  |  | 0.2 |  |  | 0.9 |  |  | 1.3 |
Effective income tax rate | 25.2 | % |  | 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 ended |  | Nine months ended
| June 30, |  | June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
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 | 3.5 |  |  | 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 compensation | 1.0 |  |  | 0.9 |  |  | 1.0 |  |  | 0.9 |
Uncertain tax positions | 0.4 |  |  | — |  |  | (0.7) |  |  | — |
Valuation allowances | 0.7 |  |  | — |  |  | 0.4 |  |  | — |
Other | 0.9 |  |  | 0.2 |  |  | 0.9 |  |  | 1.3 |
Effective income tax rate | 25.2 | % |  | 20.7 | % |  | 23.8 | % |  | 22.7 | %

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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