Presentation and Summary of Significant Accounting Policies - Total Expenditures and Amortization of Capitalized Computer Software (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Accounting Policies [Abstract]
Total capitalized computer software development costs	$ 0	$ 620	$ 3,170
Total research and development expense	17,600	16,964	15,348
Total research and development expense and capitalized computer software-development costs	17,600	17,584	18,518
Total amortization of capitalized computer software development costs	$ 3,181	$ 4,215	$ 5,871

Research and development costs including software development costs.

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- References

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Additions made to capitalized computer software costs during the period.

+ References

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 730
-Section 25
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