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Income Tax Expense - Schedule Of Actual Income Tax Expense (Benefit) From Continuing Operations (Details) | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Expense |  |  |
Federal corporate statutory rate | 21.00% | 24.50% | 35.00%
State and local, net of Federal benefits | 3.30% | 3.00% | 2.40%
Foreign | 0.70% | 0.60% | (0.10%)
Research credit | (0.90%) | (1.60%) | (1.10%)
Domestic production deduction | 0.00% | (1.10%) | (2.70%)
Change in uncertain tax positions | (0.10%) | (0.10%) | 0.00%
Executive compensation | 0.30% | (0.10%) | (0.10%)
Valuation allowance | (2.40%) | 3.00% | (0.30%)
GILTI and FDII | (0.80%) | 0.00% | 0.00%
Tax reform - impact on U.S. deferred tax assets and liabilities | (0.30%) | (37.20%) | 0.00%
Tax reform - transition tax | (0.10%) | 1.50% | 0.00%
Tax reform - taxes related to foreign unremitted earnings | 0.00% | 2.80% | 0.00%
Other, net | 0.00% | 0.00% | (0.10%)
Effective income tax rate | 20.70% | (4.70%) | 33.00%

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to GILTI and FDII. + References No definition available. + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: 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=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 3: 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=84230637&loc=d3e32687-109319 + Details
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