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Operating Leases (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jul. 31, 2020 | Apr. 30, 2020
ROU Assets and Lease Liabilities [Abstract] |  |
Operating lease right-of-use assets | $ 139,798 | $ 142,716
Short-term portion of operating lease liabilities | 20,647 | 21,810
Operating lease liabilities, non-current | 156,644 | $ 159,782
Increase (decrease) in right of use assets | 300 |
Increase (decrease) in operating lease liabilities | $ 300 |

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- Definition The increase (decrease) during the reporting period in the aggregate amount of lease liabilities. + References No definition available. + Details
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Namespace Prefix: | jwa_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition The increase (decrease) during the reporting period in the aggregate amount of right of use assets. + References No definition available. + Details
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Namespace Prefix: | jwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant