Goodwill and Other Intangibles - Schedule of goodwill by segment (Details) - USD ($) $ in Thousands	May 31, 2024	May 31, 2023	May 31, 2022
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	$ 132,800	$ 132,700	$ 125,300
Operating Segments | Children's Book Publishing and Distribution
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	47,100	46,900
Operating Segments | Education Solutions
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	75,700	75,800
Operating Segments | International
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	$ 10,000	$ 10,000