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Segment Reporting - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	May 02, 2015
Net sales:
Net sales	$ 586,539	$ 570,168	$ 615,942
Long-lived assets:
Long-lived assets	66,749	73,163	72,844
United States
Net sales:
Net sales	479,846	465,598	494,860
Long-lived assets:
Long-lived assets	62,425	68,233	67,882
Outside U.S.
Net sales:
Net sales	106,693	104,570	121,082
Long-lived assets:
Long-lived assets	$ 4,324	$ 4,930	$ 4,962

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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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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