Earnings Per Common Share (Details 2)	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Reconciliation of weighted average number of shares and common stock equivalents attributable to common stock, to the entity's total weighted average number of shares and common stock equivalents, including participating securities
Denominator for diluted earnings per share - weighted average number of shares and common stock equivalents attributable to common stock	27,083,105	26,800,183	27,011,588	26,635,670
Participating securities (in shares)	417,610	482,218	430,736	512,599
Total weighted average number of shares and common stock equivalents attributable to both common stock and participating securities	27,500,715	27,282,401	27,442,324	27,148,269