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Revenue Recognition and Contracts with Customers - Schedule of Outstanding Performance Obligations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020
Disaggregation Of Revenue [Line Items] |  |
Revenue recognized | $ 15,000 | $ 48,600
Revenue deferred | 3,100 | 51,100
ASU 2014-09 |  |
Disaggregation Of Revenue [Line Items] |  |
Outstanding performance obligations at beginning of period | 14,744 | 12,213
Revenue recognized | (14,957) | (48,576)
Revenue deferred | 3,120 | 51,107
Outstanding performance obligations at end of period | $ 2,907 | $ 14,744

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- Definition Contract with customer liability revenue deferred. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Contract with customer liability revenue recognized additions made during period. + References No definition available. + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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