Goodwill and Intangible Assets - Goodwill (Details) - USD ($)	6 Months Ended
	Oct. 31, 2024	Apr. 30, 2024
Goodwill [Roll Forward]
Balance, beginning of period	$ 1,091,368,000
Balance, end of period	1,102,372,000
Goodwill	1,102,372,000	$ 1,091,368,000
Continuing Operations and Disposal Group, Held-for-Sale
Goodwill [Roll Forward]
Foreign Translation Adjustment	11,004,000
Balance, end of period	1,102,372,000
Goodwill	1,102,372,000
Research and Learning
Goodwill [Roll Forward]
Balance, beginning of period	1,091,368,000
Foreign Translation Adjustment	11,004,000
Goodwill		1,091,368,000
Research
Goodwill [Roll Forward]
Balance, beginning of period	607,289,000
Foreign Translation Adjustment	13,654,000
Balance, end of period	620,943,000
Goodwill	620,943,000	607,289,000
Learning
Goodwill [Roll Forward]
Balance, beginning of period	484,079,000
Foreign Translation Adjustment	(2,650,000)
Balance, end of period	481,429,000
Goodwill	481,429,000	484,079,000
Held for Sale or Sold
Goodwill [Roll Forward]
Balance, beginning of period	0
Foreign Translation Adjustment	0
Balance, end of period	0
Cumulative pretax noncash goodwill impairment		318,200,000
Goodwill	$ 0	$ 0