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INCOME TAX EXPENSE (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Expense [Line Items] |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  |  | $ 2,300 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00% | 24.50% | 19.00% | 69.30%
Effective Income Tax Rate Reconciliation, Percent | 12.00% |  | 26.40% |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent | 4.90% |  |  |  |  | 13.60% |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  | $ 2,300 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Percent |  | 8.90% |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount | $ 700 | $ 2,900 |  |  |  | $ 3,600 |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 12.10% | 114.90% | 5.80% |  |  | 5.80% | 3.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ 30,300 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Amount |  |  |  |  |  | $ 200 |
Postemployment Benefits Liability |  |  | $ 7,500 |  |  |  | $ 7,500
Increase in Deferred Tax Liabilities |  |  | $ 1,000 |  |  |  | 1,000
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount |  |  |  |  |  |  | $ 300
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent |  |  | 1.50% |  |  |  | 0.80%
Income Tax Expense (Benefit) | $ 2,558 |  | $ 3,590 |  |  | $ 8,498 | $ (18,280)
Tax Cuts And Jobs Act [Member] |  |  |  |  |  |  |
Income Tax Expense [Line Items] |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  | $ 700 |  |  |  | $ 24,400

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