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Goodwill And Intangible Assets (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Goodwill [Roll Forward] |  |  |
Goodwill before impairment losses, beginning balance | $ 850,435 | $ 552,234 |
Accumulated impairment losses, beginning balance | (138,297) | (32,297) |
Goodwill, beginning balance | 712,138 | 519,937 |
Acquisitions |  | 23,795 |
Disposals and foreign currency changes, net | 38,573 | (26,154) |
Impairments | 0 | (106,000) | $ 0
Goodwill before impairment losses, ending balance | 895,956 | 850,435 | 552,234
Accumulated impairment losses, ending balance | (138,297) | (138,297) | (32,297)
Goodwill, ending balance | 757,659 | 712,138 | $ 519,937
Wave HQ Inc. |  |  |
Goodwill [Roll Forward] |  |  |
Acquisitions |  | $ 300,560 |
Goodwill, ending balance | 300,560 |  |
Acquisitions |  |  |
Goodwill [Roll Forward] |  |  |
Acquisitions | $ 6,948 |  |

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