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Organization and Significant Accounting Policies - Long-Lived Assets (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Long-Lived Assets |  |  |  |
Impairment loss |  |  | $ 4,398,000 | $ 255,000
Machinery and equipment | Minimum |  |  |  |
Long-Lived Assets |  |  |  |
Estimated useful life |  | 2 years |  |
Machinery and equipment | Maximum |  |  |  |
Long-Lived Assets |  |  |  |
Estimated useful life |  | 7 years |  |
Computer equipment and software | Minimum |  |  |  |
Long-Lived Assets |  |  |  |
Estimated useful life |  | 2 years |  |
Computer equipment and software | Maximum |  |  |  |
Long-Lived Assets |  |  |  |
Estimated useful life |  | 5 years |  |
Furniture and fixtures | Minimum |  |  |  |
Long-Lived Assets |  |  |  |
Estimated useful life |  | 3 years |  |
Furniture and fixtures | Maximum |  |  |  |
Long-Lived Assets |  |  |  |
Estimated useful life |  | 7 years |  |
UAS Quantix Solution |  |  |  |
Long-Lived Assets |  |  |  |
Impairment loss | $ 4,398,000 |  |  |

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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