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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2019 | Jul. 31, 2018 | Jan. 31, 2018 | Jan. 31, 2019 | Jan. 31, 2018 | 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 | $ 4.8 |  | $ 2.6 | $ 5.0 | $ 6.4 |
Gross unrecognized tax benefit | 30.4 |  |  | $ 30.4 |  |
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 | 20.40% |  | 28.50% | 21.80% | 30.10% | 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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