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Segment Information - Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Geographic Information
Long-lived assets	$ 275,449	$ 262,989	$ 218,464
Geographic concentration | Sales
Geographic Information
Percentage of sales	100.00%	100.00%	100.00%
Domestic/United States
Geographic Information
Long-lived assets	$ 251,778	$ 239,198	$ 211,021
Domestic/United States | Geographic concentration | Sales
Geographic Information
Percentage of sales	87.00%	88.00%	89.00%
International
Geographic Information
Long-lived assets	$ 23,671	$ 23,791	$ 7,443
Canada | Geographic concentration | Sales
Geographic Information
Percentage of sales	7.00%	7.00%	7.00%
Other | Geographic concentration | Sales
Geographic Information
Percentage of sales	6.00%	5.00%	4.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
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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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