Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Income Taxes [Abstract]
Effective tax rate	28.50%	29.80%	27.90%	29.20%
Unrecognized tax benefits	$ 13.9		$ 13.9
Accrued interest and penalties on unrecognized tax benefits	1.1		1.1
Statute of limitations period, average, years			5 years
Maximum possible reduction in amount of unrecognized tax benefits			0.9
Unrecognized tax benefits potential expiration period			12 months
Unrecognized tax benefits in dispute with various taxing authorities	$ 0.2		$ 0.2