Earnings Per Common Share - Weighted Average Shares (Details) - shares	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
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	41,390,194	41,202,600	40,911,314
Participating securities (in shares)	340,363	378,706	558,252
Total weighted average number of shares and common stock equivalents attributable to both common stock and participating securities	41,730,557	41,581,306	41,469,566