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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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