ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES [Abstract]
Accrued compensation	$ 33,886	$ 35,367
Income taxes payable	23,535	18,045
Dividends payable	12,049	10,822
Taxes, other than income taxes	7,311	1,976
Interest Payable	4,351	0
Contract liabilities	5,091	4,894
Goods and services received, not yet invoiced	4,867	1,954
Environmental accrual	1,008	0
Other accrued expenses	8,302	9,925
Total	$ 100,400	$ 82,983