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Nature of Business and Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Sales returns, reserve	$ 39	$ 42
Percentage of net sales from long-term construction-type contracts	60.80%	58.10%	59.70%
Percentage of net sales from equipment contracts	31.10%	34.00%	33.00%
Deferred revenue period for recognition of product maintenance contracts	10 years
Deferred Revenue	$ 20,127	$ 17,571
Percentage of net sales from services	8.00%	7.80%	7.30%

X

- Definition

Revenue Recognition, Period of Deferred Revenue Recognition

+ References

No definition available.

+ Details

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- Definition

The percentage of net equipment contract revenue to total net revenue from the sale of equipment contracts as of year end.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of net long-term construction-type contract revenue to total net revenue from the sale of long-term construction-type contracts as of year end.

+ References

No definition available.

+ Details

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- Definition

The percentage of net service revenue to total net revenue from the sale of services as of year end.

+ References

No definition available.

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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- Definition

Amount of estimated sales returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 15
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68051624&loc=d3e47468-111626

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