Credit Facilities (Details)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2013 Multi-Currency Revolving Facility [Member] USD ($)	Jul. 31, 2012 Multi-Currency Revolving Facility [Member] USD ($)	Jul. 31, 2013 Uncommitted Credit Facilities [Member] USD ($)	Jul. 31, 2012 Uncommitted Credit Facilities [Member] USD ($)	Jul. 31, 2013 Treasury Notes [Member] USD ($)	Jul. 31, 2013 Treasury Notes [Member] EUR (€)	Jul. 31, 2012 Treasury Notes [Member] USD ($)	Jul. 31, 2013 International Subsidiaries [Member] USD ($)	Jul. 31, 2012 International Subsidiaries [Member] USD ($)	Jul. 31, 2013 European Operations [Member] USD ($)	Jul. 31, 2013 European Operations [Member] EUR (€)	Jul. 31, 2012 European Operations [Member] USD ($)
Line of Credit Facility [Line Items]
Credit facility expiration period		5 years	5 years
Credit facilities, maximum borrowing capacity		$ 250,000,000	$ 250,000,000			$ 133,000,000	€ 100,000,000				$ 59,800,000	€ 44,900,000
Credit facilities, amount outstanding		0	80,000,000	0	8,700,000	0		0	9,200,000	6,400,000	0		0
Credit facility, remaining borrowing capacity		$ 237,800,000	$ 159,100,000	$ 50,000,000	$ 41,300,000
Short-term borrowings, weighted average interest rate					1.00%				0.40%	0.50%
Number of uncommitted credit facilities	2