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Goodwill - Summary of Change in Carrying Amount of Goodwill (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 02, 2020	Jan. 27, 2019	Feb. 02, 2020		Jan. 27, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance			$ 27,222,000	[1]	$ 13,569,000
Acquisition of business (see note 3)					13,653,000
Impairment charge	$ (11,200,000)	$ 0	(11,211,000)		0
Ending balance	$ 16,011,000	$ 27,222,000	$ 16,011,000		$ 27,222,000
[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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-Name Accounting Standards Codification
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-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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
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