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INCOME TAXES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
INCOME TAXES (Details) [Line Items] |  |  |
U.S. Federal income tax provision (benefit) rate | 21.00% | 24.50% | 35.00%
Provisional income tax (expense) benefit | $ (13,100) | $ 20,587 |
Income Tax Benefits Reflected Reversal Of Previously Recorded Tax Liabilities | (576) | (421) | $ (122)
Valuation allowance increase (decrease) | 2,302 |  |
Undistributed Earnings of Foreign Subsidiaries | 83,002 |  |
Potential Tax Benefits Impact On Effective Tax Rate | 790 |  |
Liability for Uncertainty in Income Taxes, Current | 66 | 122 |
Deferred Tax Assets, Valuation Allowance | 10,823 | 8,520 |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense | 12,699 |  |
Domestic Tax Authority [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Operating Loss Carryforwards | 5,419 | 6,089 |
Interest Loss Carryforwards | 25,000 |  |
Non U S Tax Purposes [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Operating Loss Carryforwards | 7,413 | 7,319 |
State and Local Jurisdiction [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Operating Loss Carryforwards | 127,354 | 124,442 |
Foreign Tax Authority [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Operating Loss Carryforwards | 8,948 | 5,740 |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Share-based compensation, excess tax benefit, amount | 304 | $ 1,299 | $ 4,440
Capital Loss Carryforward [Member] | Domestic Tax Authority [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Tax Credit Carryforward, Amount | $ 9,524 |  |

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