GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS, Schedule of Goodwill and Net Identifiable Intangible Asset Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 307,635	$ 295,486	$ 295,486	$ 300,111
Identifiable intangible assets, net	69,327	58,775
Total goodwill and identifiable intangible assets, net	$ 376,962	$ 354,261