Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 01, 2021	Aug. 02, 2020
Segment Reporting Information [Line Items]
net sales	$ 83,047	$ 64,464
gross profit	12,499	9,901
selling, general, and administrative expenses	9,181	8,018
income from operations	3,318	1,883
interest expense		(51)
interest income	74	58
other expense	(237)	(366)
income before income taxes	3,155	1,524
Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	43,058	36,103
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	39,989	28,361
Operating Segments [Member]
Segment Reporting Information [Line Items]
net sales	83,047	64,464
selling, general, and administrative expenses	9,181	8,018
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	43,058	36,103
gross profit	6,795	4,608
selling, general, and administrative expenses	3,184	2,763
income from operations	3,611	1,845
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	39,989	28,361
gross profit	5,704	5,293
selling, general, and administrative expenses	3,437	3,180
income from operations	2,267	2,113
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
selling, general, and administrative expenses	2,560	2,075
income from operations	$ (2,560)	$ (2,075)