STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) - Summary of stock-based compensation expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Stockholders' Equity Note [Abstract]
Pre-tax compensation expense	$ 11,110	$ 11,473	$ 12,495
Tax benefit	(4,000)	(3,224)	(3,068)
Total stock-based compensation expense, net of tax	$ 7,110	$ 8,249	$ 9,427