Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Income Tax Disclosure [Abstract]
Tax benefits recognized provided percentage of likelihood of realization is more than			50.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	30.90%	36.00%	2.90%	35.80%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 4.0	$ 0.6	$ 106.7	$ 0.8
Gross unrecognized tax benefit	$ 26.8		$ 26.8