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Earnings Per Share of Common Stock (Detail)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]        
Anti-dilutive securities excluded from diluted income per share calculation 49 183 49 190