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Income Taxes (Reconciliation of U.S Statutory Rate to Effective Tax Rate) (Details) |  |  | 12 Months Ended | 21 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2019
Income Taxes |  |  |  |  |  |
Statutory tax rate | 21.00% | 35.00% | 21.00% | 24.50% | 35.00% | 21.00%
State income taxes, net of federal tax benefit |  |  | (0.10%) | (0.50%) | (0.30%) |
Taxes on international activities |  |  | 0.20% | (1.80%) | (7.60%) |
Research credit |  |  | (3.30%) | (4.80%) | (3.20%) |
Net excess income tax benefit from stock-based compensation |  |  | (3.50%) | (1.40%) | (1.40%) |
Domestic production activities deduction |  |  |  | (1.60%) | (1.50%) |
Adjustments of prior period tax items |  |  | 0.90% | (5.00%) | (0.90%) |
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 US federal corporate rate reduction on net current year US deferred tax activity |  |  |  | 2.00% |  |
Other items, net |  |  | 0.50% | 1.60% | 0.60% |
Effective tax rate |  |  | 19.00% | 17.90% | 20.70% |

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