SHAREHOLDERS' EQUITY (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Income
Gain on sale of investment securities		$ (45,234)	$ (162,121)
Income tax provision		17,500	60,800
General and administrative	$ (134,906)	(135,139)	$ (126,250)
Reclassification out of AOCI
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Income
Total reclassifications for the period	(4,286)	(30,398)
Reclassification out of AOCI | Unrealized appreciation on securities
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Income
Gain on sale of investment securities		(45,234)
Income tax provision		17,497
Net of tax		(27,737)
Reclassification out of AOCI | Amortization of net actuarial loss
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Income
General and administrative	(6,738)	(4,196)
Income tax provision	2,452	1,535
Net of tax	$ (4,286)	$ (2,661)