Consolidated Statements Of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Unearned Compensation ESOP [Member]	Retained Earnings [Member]	AOCI [Member]	Total
Balance at Sep. 30, 2013	$ 1,478	$ 1,235,781	$ (44,603)	$ 432,203	$ 7,267	$ 1,632,126
Net income				37,501		37,501
Other comprehensive income (loss), net of tax					(2,241)	(2,241)
ESOP activity, net		188	826			1,014
Restricted stock activity, net		87				87
Stock-based compensation		1,105				1,105
Repurchase of common stock	(48)	(39,903)		(17,255)		(57,206)
Stock options exercised	1	410				411
Dividends on common stock to stockholders ($0.58 per share)				(82,792)		(82,792)
Balance at Mar. 31, 2014	$ 1,431	$ 1,197,668	$ (43,777)	$ 369,657	$ 5,026	$ 1,530,005