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Income Taxes - Schedule of Reconciliation of Income Tax Computed at U.S. Federal Statutory Tax Rates to Income Tax Expense (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Effective Rate Reconciliation |  |  |  |
U.S. federal tax rate | 35.00% | 21.00% | 21.00% | 24.50%
State income taxes, net |  | 2.80% | 2.50% | 2.10%
Foreign taxes |  | 0.80% | (0.20%) | 1.00%
Valuation allowance |  | 3.30% | (0.10%) | (1.40%)
Domestic tax credits |  | (3.20%) | (1.00%) | (2.10%)
Manufacturing deduction |  | 0.00% | (0.10%) | (1.60%)
Foreign-derived intangible income deduction |  | (0.40%) | (1.00%) | 0.00%
Share-based compensation |  | 0.00% | 0.10% | (0.70%)
Remeasurement of deferred taxes - U.S. Tax Reform |  | 0.00% | 0.00% | (5.10%)
Mandatory repatriation tax - U.S. Tax Reform |  | 0.00% | 0.70% | 3.30%
Other, net |  | 1.40% | 0.90% | 0.80%
Effective income tax rate |  | 25.70% | 22.80% | 20.80%

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