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Income Taxes (Details) - USD ($) $ in Millions			3 Months Ended			12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Oct. 31, 2018	Jul. 31, 2018	Oct. 31, 2017	Jul. 31, 2018
Tax benefits recognized provided percentage of likelihood of realization is more than			50.00%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense			$ 0.2		$ 3.8
Gross unrecognized tax benefit			$ 29.3
Other Tax Expense Benefit Transition Tax Net of Foreign Tax Credit				$ 12.4
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	23.30%		32.00%	26.90%
Domestic Tax Authority [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						10.50%

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Other Tax Expense Benefit Transition Tax Net of Foreign Tax Credit

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Represents the tax benefits recognized provided percentage of likelihood of realization is more than during the period.

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

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of unrecognized tax benefits.

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