Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Income Taxes [Abstract]
Effective tax rate	29.40%	28.50%	28.00%	27.90%
Tax benefit associated with the favorable settlement of a tax audit				$ 6.4
Unrecognized tax benefits	17.1		17.1
Accrued interest and penalties on unrecognized tax benefits	1.8		1.8
Statute of limitations period, average, years			5 years
Maximum possible reduction in amount of unrecognized tax benefits			$ 1.0
Unrecognized tax benefits potential expiration period			12 months