Income Taxes (Details 5)	12 Months Ended
	Jul. 31, 2012
United States Federal [Member] | Maximum [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	2012
United States Federal [Member] | Minimum [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	2009
France [Member] | Minimum [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	2012
Germany [Member] | Maximum [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	2012
Germany [Member] | Minimum [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	2006
United Kingdom [Member] | Maximum [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	2012
United Kingdom [Member] | Minimum [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	2009