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GOODWILL AND INTANGIBLE ASSETS (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Jan. 31, 2021 | Jan. 31, 2020
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 | 6,924 | 23,421
Disposals and foreign currency changes, net | 26,554 | (5,088)
Impairments | 0 | 0
Goodwill before impairment losses, ending balance | 883,913 | 871,127
Accumulated impairment losses, ending balance | (138,297) | (32,297)
Goodwill, ending balance | $ 745,616 | 838,830
Wave |  |
Goodwill [Roll Forward] |  |
Acquisitions |  | $ 300,560

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