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Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Capital Leased Assets |  |  |
Rent expense under operating leases | $ 2,224 | $ 1,936 | $ 1,862
Minimum | Capital Lease Obligations |  |  |
Capital Leased Assets |  |  |
Capital lease term | 5 years |  |
Maximum | Capital Lease Obligations |  |  |
Capital Leased Assets |  |  |
Capital lease term | 20 years |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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