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INCOME TAX EXPENSE (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
INCOME TAX EXPENSE |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | 18.40% |  | 19.40% |  |  | 19.20% |  | (28.10%) |
Income Tax Expense (Benefit) |  | $ 4,825 |  | $ 4,297 |  |  | $ 13,323 |  | $ (13,983) |
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount |  | 100 | $ 2,300 |  |  |  | 2,400 |  |  |
Amended return benefit |  | $ 100 | $ 200 |  |  |  | $ 300 |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent |  | 1.00% |  |  |  |  | 4.10% |  |  |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent |  | 1.80% |  | 1.90% |  |  | 0.70% |  | 0.90% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  | 35.00% | 21.00% | 24.50% |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  |  | $ 400 | $ 1,000 | $ (30,300) |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  |  | 1.50% |  |  |  |  | 61.70% |
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount | $ 4,100 | $ 500 |  | $ 700 |  | 2,900 |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  |  |  |  | $ 2,300 |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent |  | 2.10% |  |  |  |  | 8.20% |  | 4.70% |
Effective Income Tax Rate Reconciliation, Deduction, Amount |  | $ 300 |  |  |  |  |  |  | $ 300 |
Effective Income Tax Rate Reconciliation, Deduction, Percent |  | 1.00% |  | 2.90% |  |  | 0.40% |  | 1.40% | 1.60%
Additional Pension Contribution to be Made |  |  |  |  | $ 7,500 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  |  |  | 1.40% |  |  |  |  | 0.70% |
Tax Cuts And Jobs Act [Member] |  |  |  |  |  |  |  |  |  |
INCOME TAX EXPENSE |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  | $ 100 |  |  |  |  | $ 24,300 |

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