Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2022	Aug. 01, 2021
Segment Reporting Information [Line Items]
net sales	$ 62,604	$ 83,047
gross (loss) profit	4,128	12,499
selling, general, and administrative expenses	8,866	9,181
(loss) income from operations	(4,738)	3,318
interest income	17	74
other expense	(82)	(237)
(Loss) income before income taxes	(4,803)	3,155
Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	29,371	43,058
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	33,233	39,989
Operating Segments [Member]
Segment Reporting Information [Line Items]
net sales	62,604	83,047
selling, general, and administrative expenses	8,866	9,181
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	29,371	43,058
gross (loss) profit	(37)	6,795
selling, general, and administrative expenses	2,885	3,184
(loss) income from operations	(2,921)	3,611
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	33,233	39,989
gross (loss) profit	4,165	5,704
selling, general, and administrative expenses	3,622	3,437
(loss) income from operations	542	2,267
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
selling, general, and administrative expenses	2,359	2,560
(loss) income from operations	$ (2,359)	$ (2,560)