Earnings Per Common Share (Details 2) - shares	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
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	41,202,600	40,911,314	40,556,892
Participating securities (in shares)	378,706	558,252	639,827
Total weighted average number of shares and common stock equivalents attributable to both common stock and participating securities	41,581,306	41,469,566	41,196,719