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Net Income Per Share Attributable to Common Stock - Additional Information (Detail)	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Income Per Common Share [Line Items]
Weighted average numbers of securities	0	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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