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Earnings Per Share of Common Stock (Detail)	3 Months Ended		6 Months Ended
Earnings Per Share of Common Stock (Detail)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Anti-dilutive securities excluded from diluted income per share calculation	35,000,000	49,000,000	35,000	49,000

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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