Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Effective tax rate for fiscal year	27.90%	27.80%	18.30%
Average underlying tax rate	29.70%
Discrete tax benefits	$ 5.8	$ 4.3
Additional undistributed earnings of non-U.S. subsidiaries	623.0
Percentage of net operating loss carryforward expiration within three years	12.00%
Expiration period for net operating losses carryforwards, in years	3
Remaining net operating loss carryforwards expiration period, in years, minimum	5
Existing valuation allowance	0.7
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 a gross basis	1.5	2.5
Statutes of limitations period, in years	5
Maximum reduction in amount of unrecognized tax benefits	3.0
Unrecognized tax benefits in dispute with various taxing authorities	0.2
State And Local Jurisdiction [Member]
Future local income tax payments	1.2
International Subsidiaries [Member]
Cumulative pre-tax loss carryforwards	$ 4.8