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Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
	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.

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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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

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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