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Basis of Presentation (Details) - USD ($) $ in Millions	Jul. 31, 2021	Apr. 30, 2021
Basis of Presentation [Abstract]
Intercompany receivables	$ 189.1	$ 188.8

X

- Definition

Amount of intercompany receivables.

+ References

No definition available.

+ Details

Name:	jwa_IntercompanyReceivables
Namespace Prefix:	jwa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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