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				57,484		57,484
Other comprehensive income (loss), net of tax					(167)	(167)
ESOP activity, net		277	1,239			1,516
Restricted stock activity, net		119				119
Stock-based compensation		1,617				1,617
Repurchase of common stock	(55)	(46,293)		(19,997)		(66,345)
Stock options exercised	1	410				411
Dividends on common stock to stockholders ($0.91 per share)				(127,854)		(127,854)
Balance at Jun. 30, 2014	$ 1,424	$ 1,191,911	$ (43,364)	$ 341,836	$ 7,100	$ 1,498,907