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Temporary Equity - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Maximum [Member] | Sep. 30, 2012 Minimum [Member] | Sep. 30, 2012 Subsequent Event [Member] Maximum [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-2 Preferred Stock [Member] | Sep. 30, 2011 Series A-2 Preferred Stock [Member] | Aug. 05, 2011 Series A-2 Preferred Stock [Member]
Summary Activity In Gold Bullion [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock issued |  |  |  |  |  |  | 280 | 280 |  | 120 | 120
Aggregate gross proceeds form issuance of preferred stock | $ 400,000 |  |  |  |  | $ 280,000 |  |  | $ 120,000 |  |
Preferred stock redeemable date | May 13, 2018 |  |  |  |  |  |  |  |  |  |
Initial conversion price per share |  |  |  |  |  | $ 6.50 |  |  | $ 7.00 |  |
Liquidation preference of convertible preferred stock, on purchase price | 150.00% |  |  |  |  |  |  |  |  |  |
Accrual of cumulative quarterly cash dividend annualized rate | 8.00% |  |  |  |  |  |  |  |  |  |
Non-cash principal accretion at an annualized rate | 4.00% |  | 2.00% | 0.00% |  |  |  |  |  |  |
Accretion rate |  |  | 4.00% | 2.00% | 2.00% |  |  |  |  |  |
Fair value of bifurcated conversion on preferred stock |  | (27,910) |  |  |  | 85,700 |  |  | 17,560 |  |
Residual aggregate value of the host contract | 296,740 |  |  |  |  |  |  |  |  |  |
Issuance costs | 14,027 |  |  |  |  | 11,058 |  |  | 2,969 |  |
Resulting of issuance price | 117,287 |  |  |  |  |  |  |  |  |  |
Resulting of initial carrying value | $ 282,713 |  |  |  |  |  |  |  |  |  |
Preferred stock contractual expected life | 7 years |  |  |  |  |  |  |  |  |  |

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- Definition Costs incurred and are directly related to generating contract revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The excess of (1) the fair value of all securities and other consideration transferred in transactions by the registrant to the holders of the convertible preferred stock over (2) the fair value of securities issuable pursuant to the original conversion terms, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6802175&loc=d3e42851-122695 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number D-42 -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. + 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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