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Earnings Per Share (Calculation of Undistributed Earnings) (Parenthetical) (Detail)
3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share [Abstract]        
Incremental shares of common stock 308,000 236,000 308,000 392,000