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Nature of Business and Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Precontract costs	$ 857	$ 217
Minimum
Product Warranty Liability [Line Items]
Standard parts warranty period	1 year
Installation warranty period	1 year
Maximum
Product Warranty Liability [Line Items]
Standard parts warranty period	5 years
Installation warranty period	10 years

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- Definition

Product Warranty Accrual, Standard Parts Warranty Coverage Term

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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