Income Taxes (Details 3)	12 Months Ended
	Jul. 31, 2011
United States Federal [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	F’09 — F’11
France [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	F’08 — F’11
Germany [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	F’03 — F’11
United Kingdom [Member]
Open tax years for Company's major jurisdictions
Open tax years for Company's major jurisdictions	F’09 — F’11