INCOME TAXES (Schedule of Components of Income Tax Provision (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Current—domestic	$ 2,454	$ 453	$ 773
Deferred—domestic	13,019	(4,061)	(980)
Current—foreign	32,480	48,691	56,968
Deferred—foreign	(470)	1,314	(290)
Provision for income taxes	$ 47,483	$ 46,397	$ 56,471