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Product Development Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Apr. 30, 2017
Product Development Assets [Abstract]
Product development assets	$ 78,814	$ 80,385
Book Composition Costs [Member]
Product Development Assets [Abstract]
Product development assets	24,887	28,884
Accumulated amortization	188,700	172,600
Other Product Development Costs [Member]
Product Development Assets [Abstract]
Product development assets	53,927	51,501
Accumulated amortization	$ 49,400	$ 33,500

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- References

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- Definition

Product development assets consist of composition costs and royalty advances to authors. Composition costs, primarily represent the costs incurred to bring an edited commercial manuscript to publication including typesetting, proofreading, design and illustration, etc. Royalty advances to authors are capitalized and, upon publication, are recovered as royalties earned by the authors based on sales of the published works.

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- Definition

Accumulated amortization of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs, deferred acquisition costs of insurance companies, or deferred leasing costs for real estate operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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