Net Income Per Share (Details) - shares shares in Thousands	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Earnings Per Share [Abstract]
Weighted average common shares outstanding	120,155	126,217
Effect of dilutive securities - stock options	5,417	5,300
Weighted average common and dilutive potential common shares outstanding	125,572	131,517