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Assets Held for Sale (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 28, 2018	Jan. 27, 2019	Apr. 28, 2019	Apr. 29, 2018	Apr. 30, 2017
Long Lived Assets Held-for-sale [Line Items]
Proceeds from the sale of property, plant, and equipment			$ 1,894,000	$ 6,000	$ 141,000
Gain on sale of property, plant, and equipment			1,452,000		$ 131,000
Upholstery Fabrics [Member]
Long Lived Assets Held-for-sale [Line Items]
Property, plant, and equipment classified as held for sale	$ 393,000
Impairment of assets held for sale	$ 0
Proceeds from the sale of property, plant, and equipment		$ 1,900,000
Gain on sale of property, plant, and equipment		$ 1,500,000	1,486,000
Upholstery Fabrics [Member] | Property, Plant and Equipment [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale			$ 0

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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- Definition

The increase (decrease) during the period in book value of long-lived assets that the reporting entity plans to sell within one year (or one business cycle).

+ References

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-Topic 230
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-Paragraph 28
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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

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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-Section 45
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