Exit and Disposal Activity - Summary of Restructuring Credit and Related Charges Associated with Exit and Disposal Activity (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Jan. 27, 2019	Apr. 28, 2019	Apr. 30, 2017
Restructuring Cost and Reserve [Line Items]
Inventory markdowns		$ 1,564
Employee termination benefits		661
Gain on sale of property, plant, and equipment		(1,452)	$ (131)
Restructuring credit and related charges		1,563
Upholstery Fabrics [Member]
Restructuring Cost and Reserve [Line Items]
Other operating costs associated with a closed facility		824
Gain on sale of property, plant, and equipment	$ (1,500)	$ (1,486)

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

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

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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 cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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