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Segment Information, Reconciliation of Consolidated U.S. GAAP Operating Income (Loss) to Non-GAAP Adjusted Contribution to Profit (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2021 | Jan. 31, 2021 | Oct. 31, 2020 | Jul. 31, 2020 | Apr. 30, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Reconciliation of Consolidated US GAAP Operating Income (Loss) to Non-GAAP Adjusted Contribution to Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
US GAAP Operating Income (Loss) |  | $ 51,200 | $ 34,400 | $ 69,900 | $ 30,000 | $ (170,700) | $ 48,500 | $ 63,400 | $ 4,500 | $ 185,511 | $ (54,287) | $ 223,989
Adjustments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related charges (credit) | [1] |  |  |  |  |  |  |  |  | 33,310 | 32,607 | 3,118
Impairment of goodwill | [1] |  |  |  |  |  |  |  |  | 0 | 110,000 | 0
Non-GAAP Adjusted Contribution to Profit |  |  |  |  |  |  |  |  |  | 218,821 | 180,668 | 227,107
Developed Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets | [1] |  |  |  |  |  |  |  |  | 0 | 2,841 | 0
Blackwell Trade Name [Member] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets | [1] |  |  |  |  |  |  |  |  | $ 0 | $ 89,507 | $ 0
[1] | See Note 7, “Restructuring and Related Charges” and Note 11, “Goodwill and Intangible Assets” for these charges by segment.

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