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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Stock Repurchased During Period, Value |  | $ 317,020 | $ 2,000,000
Treasury Stock Acquired, Average Cost Per Share |  | $ 22.61 | $ 35.46
Common Stock |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Stock Repurchased During Period, Shares |  | 14,020 | 56,400
Stock Repurchased During Period, Value |  | $ 140 |

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