STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) - Summary of stock-based compensation expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Stockholders' Equity Note [Abstract]
Pre-tax compensation expense	$ 11,473	$ 12,495	$ 10,439
Tax benefit	(3,224)	(3,068)	(2,547)
Total stock-based compensation expense, net of tax	$ 8,249	$ 9,427	$ 7,892