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