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Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2019	Apr. 29, 2018	Apr. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance	$ 13,569	$ 11,462	$ 11,462
acquisition of assets (note 2)	13,653	2,107	0
Loss on impairment	0	0	0
ending balance	$ 27,222	$ 13,569	$ 11,462

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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-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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