Earnings Per Common Share - Weighted Average Shares (Details) - shares	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
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	41,410,712	41,248,557	41,380,305	41,183,309
Participating securities (in shares)	340,708	342,850	342,746	390,449
Total weighted average number of shares and common stock equivalents attributable to both common stock and participating securities	41,751,420	41,591,407	41,723,051	41,573,758