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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective tax rate, change from prior year, percent |  |  |  |  |  |  |  |  | (26.80%) |  |
Net loss from discontinued operations, net of tax benefits | $ (3,037) | $ (2,720) | $ (5,254) | $ (2,749) | $ (3,218) | $ (3,302) | $ (2,805) | $ (2,647) | $ (13,760) | $ (11,972) | $ (9,286)
Tax benefits from discontinued operations |  |  |  |  |  |  |  |  | 7,016 | 6,986 | 5,414
Net deferred tax assets |  |  |  |  |  |  |  |  | (60,600) |  |
Valuation on deferred tax assets increase |  |  |  |  |  |  |  |  | $ 26,400 |  |
Document Fiscal Year Focus |  |  |  |  |  |  |  |  | 2018 |  |
Unrecognized tax benefits that would impact effective tax rate | 132,400 |  |  |  | 118,200 |  |  |  | $ 132,400 | 118,200 | 82,300
Amount of unrecorded benefit | 10,000 |  |  |  |  |  |  |  | 10,000 |  |
Total gross interest and penalties accrued | 18,700 |  |  |  | $ 21,000 |  |  |  | $ 18,700 | $ 21,000 | $ 22,300
U.S. statutory tax rate |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
State And Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards, valuation allowance | 21,800 |  |  |  |  |  |  |  | $ 21,800 |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards, valuation allowance | $ 27,300 |  |  |  |  |  |  |  | $ 27,300 |  |

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