Credit Facilities (Details)	12 Months Ended		12 Months Ended
	Jul. 31, 2014 USD ($)	Jul. 31, 2013 USD ($)	Jul. 31, 2014 Multi-Currency Revolving Facility [Member] USD ($)	Jul. 31, 2013 Multi-Currency Revolving Facility [Member] USD ($)	Jul. 31, 2014 Uncommitted Credit Facilities [Member] USD ($)	Jul. 31, 2013 Uncommitted Credit Facilities [Member] USD ($)	Jul. 31, 2014 Treasury Notes [Member] USD ($)	Jul. 31, 2014 Treasury Notes [Member] EUR (€)	Jul. 31, 2013 Treasury Notes [Member] USD ($)	Jul. 31, 2014 International Subsidiaries [Member] USD ($)	Jul. 31, 2013 International Subsidiaries [Member] USD ($)	Jul. 31, 2014 European Operations [Member] USD ($)	Jul. 31, 2014 European Operations [Member] EUR (€)	Jul. 31, 2013 European Operations [Member] USD ($)
Line of Credit Facility [Line Items]
Credit facility expiration period			5 years
Credit facilities, maximum borrowing capacity			$ 250,000,000				$ 133,900,000	€ 100,000,000				$ 58,300,000	€ 43,600,000
Credit facilities, amount outstanding			180,000,000	0	4,300,000	0	0		0	1,000,000	9,200,000	0		0
Credit facility, remaining borrowing capacity	$ 62,200,000	$ 237,800,000			$ 45,700,000	$ 50,000,000				$ 57,500,000	$ 50,400,000
Short-term borrowings, weighted average interest rate					0.91%					0.75%	0.44%
Number of uncommitted credit facilities	2