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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
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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 |  |  |  |  |  |

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- Definition Accretion To Preferred Stock + References No definition available. + Details
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- Definition Amount Allocated To Embedded Conversion Option + References No definition available. + Details
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- Definition Preferred Stock Issuance Cost + References No definition available. + Details
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- Details
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- Definition Temporary Equity And Preferred Stock Carrying Amount + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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- Definition Value of new stock classified as temporary equity issued during the period. + References No definition available. + Details
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