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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Apr. 30, 2019	Jul. 31, 2018	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
Tax benefits recognized provided percentage of likelihood of realization is more than				50.00%
Other Tax Expense (Benefit)	$ 10.2
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	29.1		$ 3.1	$ 34.1	$ 9.4
Gross unrecognized tax benefit	33.6			$ 33.6
Other Tax Expense Benefit Transition Tax Net of Foreign Tax Credit	$ 1.1	$ 12.4
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	5.60%		25.60%	15.40%	28.30%	26.90%
Domestic Tax Authority [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		35.00%			10.50%

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Other Tax Expense Benefit Transition Tax Net of Foreign Tax Credit

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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