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Leases - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Apr. 30, 2020
Leases [Abstract] |  |  |  |  |
Right of use assets | $ 9,715 |  | $ 9,715 |  | $ 9,312
Operating cash paid to settle lease liabilities |  |  | $ 1,299 | $ 1,154 |
Remaining lease term (in years) |  |  | 10 years |  |
Option to extend, term (in years) |  |  | 5 years |  |
Option to terminate, term (in years) |  |  | 1 year |  |
Operating lease, expense | 718 | $ 645 | $ 2,032 | 1,770 |
Operating lease, short term, expense | $ 267 | $ 215 | $ 733 | $ 673 |
Weighted average remaining lease term, operating lease (in years) | 6 years 1 month 6 days |  | 6 years 1 month 6 days |  |
Weighted average discount rate, operating lease | 4.10% |  | 4.10% |  |
Weighted average remaining lease term, finance lease (in years) | 4 years 7 months 6 days |  | 4 years 7 months 6 days |  |
Weighted average discount rate, finance lease | 10.00% |  | 10.00% |  |

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- Definition Weighted average discount rate for finance lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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