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Income Taxes | 3 Months Ended
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480990/946-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//740/tableOfContent Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-14 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-21 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 270 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482526/740-270-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 17 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-17 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482603/740-30-50-2 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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