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Income Taxes (Reconciliation of U.S Statutory Rate to Effective Tax Rate) (Details) |  |  | 12 Months Ended | 33 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Statutory tax rate | 21.00% | 35.00% | 21.00% | 21.00% | 24.50% | 35.00% | 21.00%
State income taxes, net of federal tax benefit |  |  | 0.30% | (0.10%) | (0.50%) |  |
Taxes on international activities |  |  | (2.10%) | 0.20% | (1.80%) |  |
Research credit |  |  | (3.60%) | (3.30%) | (4.80%) |  |
Net excess income tax benefit from stock-based compensation |  |  | (2.80%) | (3.50%) | (1.40%) |  |
Domestic production activities deduction |  |  |  |  | (1.60%) |  |
Adjustments of prior period tax items |  |  | 1.00% | 0.90% | (5.00%) |  |
Effect of U.S. federal corporate rate reduction on net beginning U.S. deferred tax liability |  |  |  |  | (5.00%) |  |
Transition Tax |  |  |  | 3.30% | 6.20% |  |
Increased deferred tax liability associated with anticipated repatriation taxes |  |  |  |  | 3.70% |  |
Effect of U.S. federal corporate rate reduction on net current year U.S. deferred tax activity |  |  |  |  | 2.00% |  |
Other items, net |  |  | 0.90% | 0.50% | 1.60% |  |
Effective tax rate |  |  | 14.70% | 19.00% | 17.90% |  |

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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 income tax rates. + References Reference 1: 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.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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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