ESOP (Narrative) (Details) (USD $)	12 Months Ended					12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2015 Forecast [Member]	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 IPO [Member]	Sep. 30, 2014 Corporate Reorganization [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of shares acquired by ESOP trust						3,024,574	4,726,000
Number of shares acquired by ESOP post corporate reorganization						6,846,728
ESOP loan maturity date						Sep. 30, 2013	Sep. 30, 2040
Shares Held In Employee Stock Ownership Plan, Allocated	165,198
Shares Held In Employee Stock Ownership Plan, Committed-to-be-Released				165,198
Compensation expense related to the ESOP including dividends	$ 3,800,000	$ 9,700,000	$ 6,700,000
Portion of compensation expense related to the ESOP attributable to changes in Company stock price	362,000	3,700,000	3,400,000
Dividends on unallocated ESOP shares in excess of debt service payments	$ 1,700,000	$ 3,000,000	$ 325,000
Percentage of ESOP shares participant may diversify once age requirement is met					25.00%
Required age of participant in order to diversify ESOP shares, years					50