Earnings Per Common Share (Details 2)	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
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	40,774,860	40,361,681
Participating securities (in shares)	598,209	679,892
Total weighted average number of shares and common stock equivalents attributable to both common stock and participating securities	41,373,069	41,041,573