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Income Taxes Rate Reconciliation (Tables) | 6 Months Ended
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Mar. 31, 2022
Income Tax Disclosure [Abstract] |
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 |  | Six months ended
| March 31, |  | March 31,
| 2022 |  | 2021 |  | 2022 |  | 2021
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 | 3.6 |  |  | 4.2 |  |  | 3.6 |  |  | 4.2 |
Excess tax benefits related to stock-based compensation | — |  |  | (0.3) |  |  | (0.2) |  |  | (0.2) |
Tax credits | (1.3) |  |  | (1.1) |  |  | (1.3) |  |  | (1.1) |
Global Intangible Low-Taxed Income | 0.8 |  |  | 0.6 |  |  | 0.8 |  |  | 0.6 |
Foreign income tax rate differential | (1.4) |  |  | (0.3) |  |  | (1.4) |  |  | (0.3) |
Valuation allowances | (0.3) |  |  | (0.6) |  |  | 0.2 |  |  | (0.2) |
Other | 0.7 |  |  | 2.1 |  |  | 0.9 |  |  | 1.7 |
Effective income tax rate | 23.1 | % |  | 25.6 | % |  | 23.6 | % |  | 25.7 | %

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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