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INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Apr. 30, 2020
Income Tax Disclosure [Abstract] |  |  |
Effective tax rate | 9.00% | 29.20% |
Increase in effective tax rate from discrete item, percent | 4.90% | 4.30% |
Discrete income tax expense (benefit) | $ 19,500 | $ (27,700) |
Gross unrecognized tax benefits increase (decrease) | 65,600 | (36,400) |
Change in tax benefits that are reasonably possible | 71,000 |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits, beginning balance | 233,690 | 148,700 | $ 168,062
Additions based on tax positions related to prior years | 117,770 |  |
Reductions based on tax positions related to prior years | (31,958) |  |
Additions based on tax positions related to the current year | 11,795 |  |
Reductions related to settlements with tax authorities | (26,556) |  |
Expiration of statute of limitations | (5,423) |  |
Unrecognized tax benefits. ending balance | $ 233,690 | $ 148,700 | $ 168,062

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