Warranty Reserves Estimated Cost (Details) - USD ($)	12 Months Ended
Apr. 30, 2018	Apr. 30, 2017
Warranty Reserves
Standard Product Warranty Accrual, Preexisting, Increase (Decrease)		$ 1,651,000
Product Warranty Expense	$ 2,198,000	1,762,000
UAS
Warranty Reserves
Product Warranty Expense	$ 0	441,000
UAS \| Warranty reserve.
Warranty Reserves
Standard Product Warranty Accrual, Preexisting, Increase (Decrease)		$ 1,651,000

The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(3,4))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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.

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- Definition

Amount of increase (decrease) in the standard product warranty accrual from changes in estimates attributable to preexisting product warranties. Excludes extended product warranties.

+ References

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- Details

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