Goodwill and Intangible Assets - Goodwill (Details) - USD ($)	3 Months Ended
	Jul. 31, 2024	Apr. 30, 2024
Goodwill [Roll Forward]
Balance, beginning of period	$ 1,091,368,000
Balance, end of period	1,099,817,000
Goodwill	1,099,817,000	$ 1,091,368,000
Continuing Operations and Disposal Group, Held-for-Sale
Goodwill [Roll Forward]
Foreign Translation Adjustment	8,449,000
Balance, end of period	1,099,817,000
Goodwill	1,099,817,000
Research and Learning
Goodwill [Roll Forward]
Balance, beginning of period	1,091,368,000
Foreign Translation Adjustment	8,449,000
Goodwill		1,091,368,000
Research:
Goodwill [Roll Forward]
Balance, beginning of period	607,289,000
Foreign Translation Adjustment	10,539,000
Balance, end of period	617,828,000
Goodwill	617,828,000	607,289,000
Learning:
Goodwill [Roll Forward]
Balance, beginning of period	484,079,000
Foreign Translation Adjustment	(2,090,000)
Balance, end of period	481,989,000
Goodwill	481,989,000	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