Business Segment Information (Details 2)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Revenue from customers located outside of the United States [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue from customers	29.00%	30.00%	30.00%
Revenue from customers located in the United Kingdom [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue from customers	23.00%	20.00%	19.00%