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INCOME TAX EXPENSE (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
INCOME TAX EXPENSE |  |  |  |  |  |
Effective income tax rate | 14.30% |  | 19.50% |  | 15.90% | 19.40%
Increase (decrease) in valuation allowance (as a percent) |  | (5.10%) | 1.40% |  |  | 4.30%
Reduction in valuation allowance for excess foreign tax credits |  | $ 2.8 | $ 0.1 | $ 2.3 |  | $ 2.4
Amended return receivable |  |  | $ 0.1 | $ 0.2 |  | $ 0.3
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent | 6.30% |  |  |  | 2.40% |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent | 1.40% |  | 1.80% |  | 0.60% | 0.60%
Effective Income Tax Rate Reconciliation, Deduction, Percent | 1.10% |  |  |  | 0.40% |
Effective Income Tax Rate Reconciliation, Research Tax Credit And Adjustments For Prior Years' Tax Return To Provision True-Ups, Percent | 1.60% |  |  |  | 0.60% |
Foreign tax credit | 6.30% |  |  |  | 2.40% |

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