Balance Sheet Components - Additional Information (Details) - USD ($)	12 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Balance Sheet Components [Abstract]
Depreciation expense	$ 2,800,000	$ 2,700,000	$ 3,000,000.0
Goodwill impairment	$ 0	0	0
Estimated amortization period of sales commissions	5 years
Impairment of deferred contract acquisition costs recognized	$ 0	$ 0	$ 0

Balance sheet components.

No definition available.

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- Definition

Estimated Amortization Period Of Initial Acquisition Contract

+ References

No definition available.

+ Details

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- Definition

Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
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-Name Accounting Standards Codification
-Topic 350
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-Section 45
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