Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Operating Loss Carryforwards [Line Items]
Effective tax rate	28.70%	27.90%	27.80%
Average underlying tax rate	30.80%	29.70%
Discrete tax benefits	$ 7.7	$ 5.8
Additional undistributed earnings of non-U.S. subsidiaries	756.0
Cumulative pre-tax loss carryforwards	2.7
Percentage of net operating loss carryforward expiration	5.00%
Expiration period for net operating losses carryforwards, in years	3 years
Remaining net operating loss carryforwards expiration period, in years	5 years
Existing valuation allowance	0.5
Largest amount of tax benefit that in the Company's judgment is likely to be realized, in percentage	50.00%
Recognized interest expense, net of tax benefit	0.3
Accrued interest and penalties on unrecognized tax benefits	1.3	1.5
Statute of limitations period, average, years	5 years
Maximum reduction in amount of unrecognized tax benefits	2.1
Unrecognized tax benefits in dispute with various taxing authorities	0.2
State And Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Cumulative pre-tax loss carryforwards	$ 0.7