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Goodwill (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 29, 2018 | Jul. 30, 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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