Earnings Per Common Share - Weighted Average Shares (Details) - shares	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 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)	42,309,216	41,757,116	41,635,078
Participating securities (in shares)	5,716	38,905	148,700
Total weighted average number of shares and common stock equivalents attributable to both common stock and participating securities (in shares)	42,314,932	41,796,021	41,783,778