Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Feb. 02, 2020	Jan. 31, 2021	Feb. 02, 2020
Segment Reporting Information [Line Items]
net sales	$ 79,341	$ 68,518	$ 220,656	$ 208,787
gross profit from continuing operations	13,872	11,520	38,035	37,458
selling, general, and administrative expenses	9,835	8,831	27,597	27,097
total income from continuing operations	4,037	2,724	10,438	10,431
restructuring credit		35		70
interest expense			(51)	(21)
interest income	90	258	208	776
other expense	(1,010)	(282)	(2,057)	(476)
income before income taxes from continuing operations	3,117	2,700	8,538	10,710
Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	38,600	33,531	114,733	108,057
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	40,741	34,987	105,923	100,730
Operating Segments [Member]
Segment Reporting Information [Line Items]
net sales	79,341	68,518	220,656	208,787
gross profit from continuing operations	13,872	11,520	38,035	37,458
selling, general, and administrative expenses	9,835	8,831	27,597	27,097
total income from continuing operations	4,037	2,689	10,438	10,361
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	38,600	33,531	114,733	108,057
gross profit from continuing operations	6,458	4,614	18,650	16,553
selling, general, and administrative expenses	3,161	2,836	9,125	8,860
total income from continuing operations	3,297	1,778	9,525	7,692
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales	40,741	34,987	105,923	100,730
gross profit from continuing operations	7,414	6,906	19,385	20,905
selling, general, and administrative expenses	3,551	3,876	10,122	11,528
total income from continuing operations	3,863	3,030	9,263	9,378
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
selling, general, and administrative expenses	3,123	2,119	8,350	6,709
total income from continuing operations	$ (3,123)	$ (2,119)	$ (8,350)	$ (6,709)