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Leases - Lease Maturity Schedule (Details) - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
--- | --- | ---
Finance Leases |  |
2021 | $ 3,118 |
2022 | 3,110 |
2023 | 3,116 |
2024 | 2,565 |
2025 | 1,167 |
Thereafter | 10,764 |
Finance Leases | 23,840 |
Less amount representing interest | 7,094 |
Finance lease liabilities (Note 7) | 16,746 |
Operating leases |  |
2021 | 1,829 |
2022 | 1,814 |
2023 | 1,717 |
2024 | 1,683 |
2025 | 1,686 |
Thereafter | 25,335 |
Total minimum lease payments | 34,064 |
Less amount representing interest | 12,468 |
Present value of net minimum lease payments | $ 21,596 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent |
Capital leases |  |
2020 |  | $ 3,103
2021 |  | 3,109
2022 |  | 3,096
2023 |  | 3,098
2024 |  | 2,548
Thereafter |  | 9,215
Total minimum lease payments |  | 24,169
Less amount representing interest |  | 7,689
Present value of net minimum lease payments |  | 16,480
Operating leases |  |
2020 |  | 1,703
2021 |  | 1,547
2022 |  | 1,354
2023 |  | 1,228
2024 |  | 1,066
Thereafter |  | 10,438
Total minimum lease payments |  | $ 17,336

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant