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Intangible Assets - Narrative (Detail) - USD ($)	12 Months Ended
	Apr. 28, 2019	Apr. 29, 2018	Apr. 01, 2018	Apr. 30, 2017	May 01, 2016
Intangible Assets [Line Items]
Gross carrying amount of customer relationships	$ 3,100,000	$ 3,100,000
Gross carrying amount of non-compete agreement	2,000,000	2,000,000
Customer Relationships [Member]
Intangible Assets [Line Items]
Finite-lived intangible assets, net	2,538,000	2,839,000		$ 664,000	$ 715,000
Accumulated amortization	577,000	276,000
Remaining amortization expense for the fiscal year	301,000
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 7 months 6 days
Customer Relationships [Member] | Read Window Products, LLC [Member]
Intangible Assets [Line Items]
Fair market value of customer relationship			$ 2,247,000
Customer Relationships [Member] | Prior Acquisition [Member]
Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 562,000
Non-Compete Agreement [Member]
Intangible Assets [Line Items]
Finite-lived intangible assets, net	678,000	753,000		$ 828,000	$ 903,000
Accumulated amortization	1,400,000	$ 1,300,000
Remaining amortization expense for the fiscal year	75,000
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	$ 303,000
Weighted average remaining amortization period	9 years

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Intangible Assets [Line Items]

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The amount of identifiable intangible assets recognized as of the acquisition date.

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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.

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

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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.

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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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during 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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth 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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third 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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second 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.

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

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

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Gross carrying amount before accumulated amortization as of the balance sheet date of payments made to third parties in exchange for their agreement not to engage in specified competitive practices in specified geographic territories for a specified period of time.

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