Net Earnings Per Share (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Net Earnings Per Share [Abstract]
Options excluded from the diluted net earnings per share calculation	822,500	1,171,544	835,328	900,492