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Intangible Assets - Summary of Change in Carrying Amount of Finite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 03, 2020	Apr. 28, 2019	Apr. 29, 2018
Finite Lived Intangible Assets [Line Items]
acquisition of assets (note 3)		$ 6,549
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Beginning balance	$ 2,538	2,839	$ 664
acquisition of assets (note 3)			2,247
Amortization expense	(300)	(301)	(72)
Ending balance	2,238	2,538	2,839
Non-Compete Agreement [Member]
Finite Lived Intangible Assets [Line Items]
Beginning balance	678	753	828
Amortization expense	(76)	(75)	(75)
Ending balance	$ 602	$ 678	$ 753

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 350
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-Section 50
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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