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Organization and Significant Accounting Policies - Long-Lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2019
Long-Lived Assets
Impairment loss		$ 4,398
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
In-service ISR assets
Long-Lived Assets
Estimated useful life	3 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

X

- 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=121586364&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

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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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- 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.

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