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Segment Information - Financial Information for Operating Segments (Parenthetical) (Detail) $ in Thousands	3 Months Ended
	Jul. 29, 2018 USD ($)
Segment Reporting Information [Line Items]
Restructuring expense	$ 451
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring expense and related charges	2,016
Facility Closing [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring related charges	1,565
Employee termination benefits [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring expense	$ 451

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- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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