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Segment Information - Statement of Operations for Operating Segments (Parenthetical) (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jan. 27, 2019	Apr. 28, 2019	Apr. 30, 2017
Segment Reporting Information [Line Items]
Restructuring related charge for operating costs		$ 1,563
Inventory markdowns		1,564
Other non-recurring charges		(678)
Gain on sale of property, plant, and equipment		1,452	$ 131
Employee termination benefits and other operational reorganization costs		661
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Gain on sale of property, plant, and equipment	$ 1,500	1,486
Restructuring related charge for other operating costs		824
Cost of Sales [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring related charges		2,300
Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Restructuring related charges		40
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]
Restructuring related charges		(2,349)
Other non-recurring charges		(159)
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring related charge for operating costs		(1,600)
Employee termination benefits and other operational reorganization costs		661
Operating Segments [Member] \| Cost of Sales [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Employee termination benefits and other operational reorganization costs		159
Operating Segments [Member] \| Cost of Sales [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring related charge for operating costs		784
Restructuring related charges		2,300
Inventory markdowns		1,600
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 and other operational reorganization costs		89
Operating Segments [Member] \| Selling, General and Administrative Expenses [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Restructuring related charges		40
Unallocated Corporate [Member] \| Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges		$ 429