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Retirement Plans, Recent Plan Curtailments (Details)	12 Months Ended
	Apr. 30, 2020
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee retirement age limit under retirement plans	60 years
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee retirement age limit under retirement plans	65 years
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of supplemental retirement benefits	10 years

X

- Definition

Refers to the employee retirement age limit under retirement plans based on length of service and compensation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	jwa_
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Balance Type:	na
Period Type:	duration

X

- Definition

The period of time subsequent to termination of employment during which the company provides for the payment of supplemental retirement benefits for certain officers and senior management, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	jwa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: