XML 81 R64.htm IDEA: XBRL DOCUMENT
v3.20.2

Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jul. 31, 2020 | Jul. 31, 2019
Effective income tax rate [Abstract] |  |
Effective tax rate as reported | 45.10% | 8.60%
Certain discrete items | $ 0.5 |
U.K. [Member] |  |
Effective income tax rate [Abstract] |  |
Tax expense from the re-measurement legislation enacted | $ 6.7 |
Minimum [Member] | U.K. [Member] |  |
Effective income tax rate [Abstract] |  |
Foreign statutory tax rate | 17.00% |
Maximum [Member] | U.K. [Member] |  |
Effective income tax rate [Abstract] |  |
Foreign statutory tax rate | 19.00% |

X
- Definition Percentage of foreign statutory tax rate applicable to pretax income (loss). + References No definition available. + Details
Name: | jwa_ForeignStatutoryTaxRate
Namespace Prefix: | jwa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of income tax expense (benefit) related to discrete items pertaining to continuing operations. + References No definition available. + Details
Name: | jwa_IncomeTaxExpenseBenefitDiscreteItems
Namespace Prefix: | jwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
Name: | us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
Name: | us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_HerMajestysRevenueAndCustomsHMRCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |