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Goodwill (Detail) - USD ($) $ in Thousands | 6 Months Ended
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Oct. 28, 2018 | Oct. 29, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Beginning balance | $ 13,569 | [1] | $ 11,462
Acquisition of business | 13,653 |  |
Loss on impairment | 0 |  | 0
Ending balance | $ 27,222 |  | $ 11,462
[1] | Derived from audited financial statements.

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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