Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Goodwill [Roll Forward]
Balance, beginning of period	$ 1,204,050
Impairment	(108,449)	$ (99,800)	$ 0
Balance, end of period	1,091,368	1,204,050
Continuing Operations And Disposal Group, Held For Sale
Goodwill [Roll Forward]
Impairment	(108,449)
Foreign Translation Adjustment	(4,233)
Balance, end of period	1,091,368
Total excluding Held for Sale or Sold Segment
Goodwill [Roll Forward]
Balance, beginning of period	1,095,754
Impairment	0
Foreign Translation Adjustment	(4,386)
Balance, end of period	1,091,368	1,095,754
Research
Goodwill [Roll Forward]
Balance, beginning of period	609,729
Impairment	0
Foreign Translation Adjustment	(2,440)
Balance, end of period	607,289	609,729
Learning
Goodwill [Roll Forward]
Balance, beginning of period	486,025
Impairment	0
Foreign Translation Adjustment	(1,946)
Balance, end of period	484,079	486,025
Held for Sale or Sold
Goodwill [Roll Forward]
Balance, beginning of period	108,296
Impairment	(108,449)
Foreign Translation Adjustment	153
Balance, end of period	$ 0	108,296
Goodwill, accumulated impairment loss		$ 209,800