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Income Per Share of Common Stock (Narrative) (Details) - shares
3 Months Ended 6 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Income Per Share of Common Stock: [Abstract]        
Average common shares outstanding 2,015,780 2,015,780 2,015,780 2,015,780