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Income Taxes | 9 Months Ended
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Jun. 30, 2021
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,
| 2021 |  | 2020 |  | 2021 |  | 2020
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 | 4.2 |  |  | 4.5 |  |  | 4.2 |  |  | 4.5 |
Excess tax (benefits) related to stock-based compensation | — |  |  | — |  |  | (0.3) |  |  | (0.6) |
Tax credits | (1.7) |  |  | (1.7) |  |  | (1.7) |  |  | (2.6) |
Global Intangible Low-Taxed Income | 0.5 |  |  | (0.2) |  |  | 0.5 |  |  | (0.1) |
Foreign income tax rate differential | (0.4) |  |  | (0.5) |  |  | (0.4) |  |  | (0.6) |
Nondeductible compensation | 0.6 |  |  | 1.0 |  |  | 0.6 |  |  | 0.6 |
Basis difference in foreign investment | 1.2 |  |  | 0.3 |  |  | 1.2 |  |  | — |
Valuation allowances | — |  |  | (0.3) |  |  | 0.7 |  |  | (0.5) |
Reversal of uncertain tax positions | — |  |  | (2.1) |  |  | — |  |  | (0.5) |
Other | 2.6 |  |  | 1.3 |  |  | 0.5 |  |  | 1.5 |
Effective income tax rate | 28.0 | % |  | 23.3 | % |  | 26.3 | % |  | 22.7 | %
At June 30, 2021 and September 30, 2020, the gross liabilities for uncertain tax positions were $5.0 million and $4.5 million, respectively,
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,
| 2021 |  | 2020 |  | 2021 |  | 2020
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 | 4.2 |  |  | 4.5 |  |  | 4.2 |  |  | 4.5 |
Excess tax (benefits) related to stock-based compensation | — |  |  | — |  |  | (0.3) |  |  | (0.6) |
Tax credits | (1.7) |  |  | (1.7) |  |  | (1.7) |  |  | (2.6) |
Global Intangible Low-Taxed Income | 0.5 |  |  | (0.2) |  |  | 0.5 |  |  | (0.1) |
Foreign income tax rate differential | (0.4) |  |  | (0.5) |  |  | (0.4) |  |  | (0.6) |
Nondeductible compensation | 0.6 |  |  | 1.0 |  |  | 0.6 |  |  | 0.6 |
Basis difference in foreign investment | 1.2 |  |  | 0.3 |  |  | 1.2 |  |  | — |
Valuation allowances | — |  |  | (0.3) |  |  | 0.7 |  |  | (0.5) |
Reversal of uncertain tax positions | — |  |  | (2.1) |  |  | — |  |  | (0.5) |
Other | 2.6 |  |  | 1.3 |  |  | 0.5 |  |  | 1.5 |
Effective income tax rate | 28.0 | % |  | 23.3 | % |  | 26.3 | % |  | 22.7 | %

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 270 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + 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 -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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