Intangible Assets - Narrative (Detail) - USD ($)	3 Months Ended
Aug. 04, 2019	Apr. 28, 2019	Jul. 29, 2018
Intangible Assets [Line Items]
Gross carrying amount of customer relationships	$ 3,100,000	$ 3,100,000	$ 3,100,000
Gross carrying amount of non-compete agreement	2,000,000	2,000,000	2,000,000
Customer Relationships [Member]
Intangible Assets [Line Items]
Accumulated amortization	652,000	577,000	351,000
Remaining amortization expense for the fiscal year	226,000
Remaining amortization expense for the second fiscal year	301,000
Remaining amortization expense for the third fiscal year	301,000
Remaining amortization expense for the fourth fiscal year	301,000
Remaining amortization expense for the fifth fiscal year	301,000
Remaining amortization expense for the fiscal year thereafter	$ 1,033,000
Weighted average remaining amortization period	8 years 4 months 24 days
Customer Relationships [Member] \| Maximum [Member]
Intangible Assets [Line Items]
Useful life	17 years
Customer Relationships [Member] \| Minimum [Member]
Intangible Assets [Line Items]
Useful life	9 years
Non-Compete Agreement [Member]
Intangible Assets [Line Items]
Useful life	15 years
Accumulated amortization	$ 1,400,000	$ 1,400,000	$ 1,300,000
Remaining amortization expense for the fiscal year	57,000
Remaining amortization expense for the second fiscal year	75,000
Remaining amortization expense for the third fiscal year	75,000
Remaining amortization expense for the fourth fiscal year	75,000
Remaining amortization expense for the fifth fiscal year	75,000
Remaining amortization expense for the fiscal year thereafter	$ 302,000
Weighted average remaining amortization period	8 years 9 months 18 days

Intangible Assets [Line Items]

No definition available.

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- Definition

Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References