SHAREHOLDERS' EQUITY (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Pre-tax amounts:
Accumulated other comprehensive income (loss) before tax	$ 134,433	$ 218,004	$ 267,223
Rollforward of accumulated other comprehensive income (loss), net of tax
Balance	132,530		166,807
Other comprehensive loss before reclassifications	(19,006)
Amounts reclassified from accumulated other comprehensive income (loss)	(30,398)
Net current-period other comprehensive income (loss)	(49,404)
Balance	83,126		166,807
Unrecognized appreciation on securities
Pre-tax amounts:
Accumulated other comprehensive income (loss) before tax	157,838	237,214	304,396
Rollforward of accumulated other comprehensive income (loss), net of tax
Balance	144,161		189,851
Other comprehensive loss before reclassifications	(19,006)
Amounts reclassified from accumulated other comprehensive income (loss)	(27,737)
Net current-period other comprehensive income (loss)	(46,743)
Balance	97,418		189,851
Unrecognized actuarial loss
Pre-tax amounts:
Accumulated other comprehensive income (loss) before tax	(23,405)	(19,210)	(37,173)
Rollforward of accumulated other comprehensive income (loss), net of tax
Balance	(11,631)		(23,044)
Amounts reclassified from accumulated other comprehensive income (loss)	(2,661)
Net current-period other comprehensive income (loss)	(2,661)
Balance	$ (14,292)		$ (23,044)