INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	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