GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS, Schedule of Goodwill and Net Identifiable Intangible Asset Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 313,005	$ 307,635	$ 307,635	$ 295,486	$ 295,486	$ 295,486
Identifiable intangible assets, net	63,959		69,327
Total goodwill and identifiable intangible assets, net	$ 376,964		$ 376,962