Leases - Narrative (Details) $ in Millions	12 Months Ended
	May 31, 2021 USD ($) fairs	May 31, 2022 fairs
Lessee, Lease, Description [Line Items]
Asset impairment expense | $	$ 2.6
Number of book fair closed | fairs	13	13
Number of book fairs total | fairs	54	54
Operating Right Of Use Asset
Lessee, Lease, Description [Line Items]
Asset impairment expense | $	$ 9.6