INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
INCOME TAXES (Details) [Line Items]
U.S. Federal income tax provision (benefit) rate	24.50%	35.00%	35.00%
Provisional income tax (expense) benefit	$ 20,587
Share-based compensation, excess tax benefit, amount	2,193
Income Tax Benefits Reflected Reversal Of Previously Recorded Tax Liabilities	(421)	$ (122)	$ (2,172)
Valuation allowance increase (decrease)	8,946
Undistributed Earnings of Foreign Subsidiaries	64,204
Potential Tax Benefits Impact On Effective Tax Rate	1,248
Liability for Uncertainty in Income Taxes, Current	122	174
Deferred Tax Assets, Valuation Allowance	7,597	1,343
Domestic Tax Authority [Member]
INCOME TAXES (Details) [Line Items]
Operating Loss Carryforwards	6,089	1,264
Non U S Tax Purposes [Member]
INCOME TAXES (Details) [Line Items]
Operating Loss Carryforwards	7,319	7,941
State and Local Jurisdiction [Member]
INCOME TAXES (Details) [Line Items]
Operating Loss Carryforwards	124,442	114,837
Foreign Tax Authority [Member]
INCOME TAXES (Details) [Line Items]
Operating Loss Carryforwards	5,740	1,762
New Accounting Pronouncement, Early Adoption, Effect [Member]
INCOME TAXES (Details) [Line Items]
Share-based compensation, excess tax benefit, amount	$ 1,299	$ 4,440