Presentation and Summary of Significant Accounting Policies - Total Expenditures and Amortization of Capitalized Computer Software (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Accounting Policies [Abstract]
Total capitalized computer software development costs	$ 3,170	$ 5,961	$ 4,804
Research and development	15,348	13,078	11,877
Total research and development expense and capitalized computer software-development costs	18,518	19,039	16,681
Total amortization of capitalized computer software development costs	$ 5,871	$ 4,627	$ 3,690

Research and development costs including software development costs.

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- References

No definition available.

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- Definition

Additions made to capitalized computer software costs during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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Amount of expense for amortization of capitalized computer software costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
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