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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2021 | Jul. 31, 2020 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Apr. 30, 2015
Effective income tax rate [Abstract] |  |  |  |  |  |
Effective tax rate as reported | 19.10% |  | 20.70% | 14.90% | 20.30% |
Corporate tax rate |  |  |  |  |  | 35.00%
Tax benefit resulting from NOL carryback |  |  |  | $ 14.0 |  |
U.K. [Member] |  |  |  |  |  |
Effective income tax rate [Abstract] |  |  |  |  |  |
Non-cash deferred tax expense |  | $ 6.7 |  |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |
Effective income tax rate [Abstract] |  |  |  |  |  |
Refund in connection with NOL carryback | $ 20.7 |  |  | $ 20.7 |  |
Minimum [Member] | U.K. [Member] |  |  |  |  |  |
Effective income tax rate [Abstract] |  |  |  |  |  |
Foreign statutory tax rate |  | 17.00% |  |  |  |
Maximum [Member] | U.K. [Member] |  |  |  |  |  |
Effective income tax rate [Abstract] |  |  |  |  |  |
Foreign statutory tax rate |  | 19.00% |  |  |  |

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