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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
	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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Costs incurred and are directly related to generating contract revenues.

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Value of outstanding nonredeemable convertible preferred stock or outstanding convertible preferred stock that is redeemable solely at the option of the issuer.

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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.

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