Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Income Taxes [Abstract]
Effective tax rate	29.40%	25.50%
Discrete tax benefits		$ 4.3
Change in foreign income tax rate, period	5 years
Unrecognized tax benefits	17.0
Accrued interest and penalties on unrecognized tax benefits	1.3
Unrecognized tax benefits potential expiration date, months	12 months
Statute of limitations period, average, years	5 years
Maximum reduction in amount of unrecognized tax benefits	1.7
Unrecognized tax benefits in dispute with various taxing authorities	$ 0.2