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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Oct. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017 | Apr. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income taxes (benefit) | $ 122,120 | $ (49,386) | $ 165,400 | $ (43,234) | $ (216,963) |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |
U.S. statutory tax rate |  |  |  | 21.00% | 35.00% |
State income taxes, net of federal income tax benefit |  |  |  | 2.20% | 1.60% |
Earnings taxed in foreign jurisdictions |  |  |  | (2.30%) | (5.30%) |
Permanent differences |  |  |  | 0.30% | (0.50%) |
Uncertain tax positions |  |  |  | 6.00% | 6.50% |
Remeasurement of deferred tax assets and liabilities |  |  |  | 2.40% | 0.00% |
Tax benefit due to effective date of statutory rate change |  |  |  | (16.40%) | 0.00% |
One-time transition tax |  |  |  | (2.40%) | 0.00% |
Other |  |  |  | (3.10%) | (0.10%) |
Effective tax rate |  |  | 37.50% | 7.70% | 37.20% |
Loss from continuing operations | (120,805) | (150,598) | $ 441,500 | $ (562,289) | $ (582,616) |
Unrecognized tax benefits | 163,100 | $ 97,100 |  | 163,100 | 97,100 | $ 149,900
Gross unrecognized tax benefits increase (decrease) |  |  |  | 13,100 | $ (14,400) |
Change in tax benefits that are reasonably possible | 17,400 |  |  | 17,400 |  |
Effect of anticipated settlements of audit issues and expiring statutes of limitations | $ 15,100 |  |  | $ 15,100 |  |
Decrease in deferred tax assets |  |  | $ 58,400 |  |  |

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