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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration