Net Income Per Share (Details) - shares shares in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Earnings Per Share [Abstract]
Weighted average common shares outstanding	233,202	230,489	231,793
Effect of dilutive securities — stock options	5,454	9,964	10,084
Weighted average common and dilutive potential common shares outstanding	238,656	240,453	241,877