SHAREHOLDERS' EQUITY (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
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
General and administrative									(135,139)	(126,250)	(107,307)
Income tax provision									(387,548)	(392,844)	(328,971)
NET INCOME	168,688	192,279	174,570	173,182	159,797	266,159	151,080	159,603	708,719	736,639	581,045
Reclassification out of AOCI
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Income
NET INCOME									(30,398)
Reclassification out of AOCI | Unrecognized 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 INCOME									(27,737)
Reclassification out of AOCI | Unrecognized actuarial loss
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Income
General and administrative									(4,196)
Income tax provision									1,535
NET INCOME									$ (2,661)