Amount of equipment, building, and building and improvements that have not been placed into service.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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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.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017
Property, Plant and Equipment [Line Items]
land and improvements	$ 838				$ 963
buildings and improvements	30,712				31,022
leasehold improvements	2,180				1,993
machinery and equipment	72,641				72,924
office furniture and equipment	9,834				9,514
capital projects in progress	1,263				2,086
property, plant and equipment, gross	117,468				118,502
accumulated depreciation	(69,079)				(66,708)
property, plant and equipment, net	$ 48,389	$ 50,129	$ 51,325	$ 53,178	$ 51,794	$ 51,838	$ 52,530	$ 52,912
Land and Land Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
depreciable lives	10 years
Land and Land Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
depreciable lives	0 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
depreciable lives	40 years
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
depreciable lives	7 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
depreciable lives	Shorter of life of lease or useful life.
Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
depreciable lives	12 years
Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
depreciable lives	3 years
office furniture and equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
depreciable lives	10 years
office furniture and equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
depreciable lives	3 years