Credit Facilities (Details) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2012 Multi-Currency Revolving Facility [Member] USD ($)	Jul. 31, 2011 Multi-Currency Revolving Facility [Member] USD ($)	Jul. 31, 2010 Multi-Currency Revolving Facility [Member]	Jul. 31, 2012 Uncommitted Credit Facilities [Member] USD ($)	Jul. 31, 2011 Uncommitted Credit Facilities [Member] USD ($)	Jul. 31, 2012 Treasury Notes [Member] USD ($)	Jul. 31, 2012 Treasury Notes [Member] EUR (€)	Jul. 31, 2012 International Subsidiaries [Member] USD ($)	Jul. 31, 2012 Standby Letters Of Credit [Member] USD ($)	Jul. 31, 2011 Standby Letters Of Credit [Member] USD ($)	Jul. 31, 2012 European Operations [Member] USD ($)	Jul. 31, 2012 European Operations [Member] EUR (€)
Line of Credit Facility [Line Items]
Credit facility expiration period		5 years
Credit facilities, maximum borrowing capacity		$ 250.0					$ 123.1	€ 100.0				$ 53.7	€ 43.6
Credit facilities, maturity date		Apr. 02, 2013
Credit facilities, amount outstanding		80.0			8.7	13.1			6.4	10.9	11.4
Credit facility, remaining borrowing capacity		$ 159.1	$ 238.6		$ 41.3	$ 56.9
Short-term borrowings, weighted average interest rate				0.40%					0.50%
Short-term borrowings, weighted average interest rate outstanding					1.00%	0.90%
Number of uncommitted credit facilities	2