Earnings Per Common Share (Details 2)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
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	40,556,892	40,024,923	38,429,541
Participating securities (in shares)	639,827	751,896	549,579
Total weighted average number of shares and common stock equivalents attributable to both common stock and participating securities	41,196,719	40,776,819	38,979,120