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Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	Apr. 29, 2018	Apr. 30, 2017	May 01, 2016
Segment Reporting Information [Line Items]
net sales	$ 78,184	$ 85,310	$ 80,698	$ 79,533	$ 77,350	$ 76,169	$ 75,343	$ 80,682	$ 323,725	$ 309,544	$ 312,860
gross profit	14,760	17,603	15,804	16,465	17,156	16,759	16,901	18,419	64,633	69,235	65,111
selling, general, and administrative expenses	8,296	9,959	9,415	9,501	9,986	9,824	9,602	9,746	37,172	39,157	36,773
income from operations	6,464	7,644	6,389	6,964	7,170	6,935	7,299	8,673	27,461	30,078	28,338
interest expense	(26)	(31)	(37)						(94)
interest income	143	132	128	131	134	124	15	25	534	299	176
other expense	(115)	(229)	(321)	(353)	(305)	(69)	(155)	(152)	(1,018)	(681)	(616)
income before income taxes	$ 6,466	$ 7,516	$ 6,159	$ 6,742	$ 6,999	$ 6,990	$ 7,159	$ 8,546	26,883	29,696	27,898
Operating Segments [Member]
Segment Reporting Information [Line Items]
income from operations									36,817	40,471	37,794
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales									131,128	118,739	126,441
gross profit									25,836	26,170	26,393
selling, general, and administrative expenses									14,881	15,079	15,094
income from operations									10,956	11,091	11,298
Operating Segments [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales									192,597	190,805	186,419
gross profit									38,797	43,065	38,718
selling, general, and administrative expenses									12,935	13,685	12,223
income from operations									25,861	29,380	26,496
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
selling, general, and administrative expenses									9,356	10,393	9,456
income from operations									$ (9,356)	$ (10,393)	$ (9,456)