The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer.

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The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Temporary Equity - Carrying Value of Preferred Stock (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended								12 Months Ended							12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Principal accretion [Member]	Sep. 30, 2011 Principal accretion [Member]	Sep. 30, 2012 Accretion [Member]	Sep. 30, 2011 Accretion [Member]	Sep. 30, 2012 Series A Preferred Stock [Member]	Sep. 30, 2011 Series A Preferred Stock [Member]	May 13, 2011 Series A Preferred Stock [Member]	Sep. 30, 2012 Series A Preferred Stock [Member] Principal accretion [Member]	Sep. 30, 2011 Series A Preferred Stock [Member] Principal accretion [Member]	Sep. 30, 2012 Series A Preferred Stock [Member] Accretion [Member]	Sep. 30, 2011 Series A Preferred Stock [Member] Accretion [Member]	Sep. 30, 2012 Series A-2 Preferred Stock [Member]	Sep. 30, 2011 Series A-2 Preferred Stock [Member]	Aug. 05, 2011 Series A-2 Preferred Stock [Member]	Sep. 30, 2012 Series A-2 Preferred Stock [Member] Principal accretion [Member]	Sep. 30, 2011 Series A-2 Preferred Stock [Member] Principal accretion [Member]	Sep. 30, 2012 Series A-2 Preferred Stock [Member] Accretion [Member]	Sep. 30, 2011 Series A-2 Preferred Stock [Member] Accretion [Member]
Preferred Stock [Line Items]
Preferred stock issued							280	280						120	120
Initial issuance price in 2011	$ 400,000					$ 280,000							$ 120,000
Accretion		12,284	5,055	14,504	4,669				8,622	4,308	11,705	4,210				3,662	747	2,799	459
Redemption value as of September 30, 2012	417,339					292,930							124,409
Bifurcation of embedded conversion feature at issuance	(103,260)					(85,700)							(17,560)
Issuance costs	(14,027)					(11,058)							(2,969)
Carrying value of Preferred Stock as of September 30, 2012	$ 319,225					$ 212,087							$ 107,138