Earnings Per Common Share - Weighted Average Shares (Details) - shares	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
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)	42,168,805	41,705,773
Participating securities (in shares)	16,857	69,452
Total weighted average number of shares and common stock equivalents attributable to both common stock and participating securities (in shares)	42,185,662	41,775,225