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Segment Information - Other Significant Reconciling Items by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for long lived assets | $ (104,113) | $ (115,858) | $ (103,361)
Operating Segments | Research |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for long lived assets | (29,424) | (30,139) | (24,284)
Operating Segments | Academic |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for long lived assets | (39,069) | (43,580) | (36,831)
Operating Segments | Talent |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for long lived assets | (5,865) | (7,810) | (8,515)
Corporate Expenses |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for long lived assets | $ (29,755) | $ (34,329) | $ (33,731)

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