Segment Information - Financial Information for Operating Segments (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 27, 2019	Jan. 27, 2019
Segment Reporting Information [Line Items]
Restructuring credit	$ 214	$ 825
Gain on sale of property, plant, and equipment		1,456
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring credit and related charges		1,563
Restructuring credit		825
Inventory markdowns		1,564
Gain on sale of property, plant, and equipment		1,486
Restructuring related charge for other operating costs		824
Employee termination benefits		661
Cost of Sales [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring related charges		2,349
Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges		518
Selling, General and Administrative Expenses [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring related charges		40
Operating Segments [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges		678
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring credit and related charges	340	1,563
Restructuring related charges	554	2,400
Restructuring credit	214	825
Gain on sale of property, plant, and equipment	362	1,456
Employee termination benefits	148	661
Operating Segments [Member] \| Cost of Sales [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges		159
Employee termination benefits		159
Operating Segments [Member] \| Cost of Sales [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring related charges	514	2,349
Inventory markdowns		1,564
Restructuring related charge for other operating costs		784
Operating Segments [Member] \| Selling, General and Administrative Expenses [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Employee termination benefits		89
Operating Segments [Member] \| Selling, General and Administrative Expenses [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring related charges	40	40
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges	429
Unallocated Corporate [Member] \| Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges	$ 429	$ 429

Restructuring credit.

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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.

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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 other expense that is infrequent in occurrence or unusual in nature.

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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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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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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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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 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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