Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012 Y	Apr. 30, 2011
Income Taxes [Abstract]
Effective tax rate	29.00%	24.50%			28.00%	28.10%
Charges related to reorganization of subsidiary holdings		$ 1.8
Tax audit settlements			4.3	2.7
Effective income tax rate without consideration of discrete items					30.50%	29.50%
Unrecognized tax benefits	16.3	3.5	16.3	3.5	16.3	3.5
Accrued interest and penalties on unrecognized tax benefits	1.3		1.3		1.3
Statute of limitations period, average, years					5
Maximum reduction in amount of unrecognized tax benefits					2.0
Unrecognized tax benefits potential expiration date, months					12
Unrecognized tax benefits in dispute with various taxing authorities	$ 0.2		$ 0.2		$ 0.2