Earnings Per Common Share - Weighted Average Shares (Details) - shares	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
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 (in shares)	41,588,185	41,475,065
Participating securities (in shares)	225,675	309,831
Total weighted average number of shares and common stock equivalents attributable to both common stock and participating securities (in shares)	41,813,860	41,784,896