v3.26.1
Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2024
Segment Reporting Information [Line Items]      
Revenue, net $ 1,676,528 $ 1,677,609 $ 1,872,987
Cost of sales 431,509 431,380 579,722
Direct expenses 467,493 489,053 517,033
Allocated Corporate expenses 275,487 278,502 311,031
Amortization of intangible assets 53,050 51,822 55,994
Adjusted Operating Income (Loss) by segment 448,989 426,852 409,207
Reconciliation of Adjusted Operating Income by segment to Income before taxes      
Adjusted unallocated Corporate expenses (152,819) (179,882) (185,456)
Impairment of goodwill 0 0 (108,449)
Restructuring and related charges (19,203) (25,561) (63,041)
Interest expense (43,848) (52,547) (49,003)
Net foreign exchange transaction losses (6,564) (8,142) (2,959)
Net loss on sale of businesses, assets, and impairment charges related to assets held-for-sale (4,828) (23,340) (183,389)
Other (expense) income, net (6,533) 5,498 (3,957)
Legal settlement (108)    
Income (loss) before taxes 215,086 142,878 (187,047)
Total depreciation and amortization 143,477 147,126 176,989
Operating Segments      
Reconciliation of Adjusted Operating Income by segment to Income before taxes      
Total depreciation and amortization 133,620 133,202 154,555
Operating Segments | Research      
Segment Reporting Information [Line Items]      
Revenue, net 1,129,942 1,075,459 1,042,705
Cost of sales 303,702 278,867 281,109
Direct expenses 331,192 336,484 323,392
Allocated Corporate expenses 167,578 160,959 155,495
Amortization of intangible assets 44,866 43,569 44,946
Adjusted Operating Income (Loss) by segment 282,604 255,580 237,763
Reconciliation of Adjusted Operating Income by segment to Income before taxes      
Total depreciation and amortization 92,472 89,302 93,422
Operating Segments | Learning      
Segment Reporting Information [Line Items]      
Revenue, net 546,586 584,768 574,739
Cost of sales 127,807 144,758 145,054
Direct expenses 136,301 142,204 145,514
Allocated Corporate expenses 107,909 114,703 132,394
Amortization of intangible assets 8,184 8,253 9,044
Adjusted Operating Income (Loss) by segment 166,385 174,850 142,733
Reconciliation of Adjusted Operating Income by segment to Income before taxes      
Total depreciation and amortization 41,148 43,900 57,696
Operating Segments | Held for Sale or Sold      
Segment Reporting Information [Line Items]      
Revenue, net 0 17,382 255,543
Cost of sales   7,755 153,559
Direct expenses   10,365 48,127
Allocated Corporate expenses   2,840 23,142
Amortization of intangible assets   0 2,004
Adjusted Operating Income (Loss) by segment   (3,578) 28,711
Reconciliation of Adjusted Operating Income by segment to Income before taxes      
Total depreciation and amortization 0 0 3,437
Corporate Expenses      
Reconciliation of Adjusted Operating Income by segment to Income before taxes      
Total depreciation and amortization $ 9,857 $ 13,924 $ 22,434