DERIVATIVE FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivatives designated as hedging instruments | Interest rate swap contract | Interest expense
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Gain (Loss) Recognized in Statement of Income	$ (3,262)	$ 39	$ (5,799)	$ 40
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other income (expense), net
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Gain (Loss) Recognized in Statement of Income	$ (128)	$ (29)	$ (390)	$ (67)