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Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 28, 2019	Apr. 29, 2018	Apr. 30, 2017
Segment Reporting Information [Line Items]
net sales	$ 70,963	$ 77,226	$ 77,006	$ 71,473	$ 78,184	$ 85,310	$ 80,698	$ 79,533	$ 296,669	$ 323,725	$ 309,544
gross profit	12,189	14,123	13,326	10,559	14,760	17,603	15,804	16,465	50,198	64,633	69,235
selling, general, and administrative expenses	10,230	10,038	10,103	8,033	8,296	9,959	9,415	9,501	38,405	37,172	39,157
Income (loss) from operations	1,959	4,299	4,284	2,075	6,464	7,644	6,389	6,964	12,618	27,461	30,078
interest expense	(4)		(18)	(20)	(26)	(31)	(37)		(42)	(94)	0
Other non-recurring charges									(678)
restructuring credit and related charges									(1,563)
interest income	214	251	151	150	143	132	128	131	766	534	299
other expense	658	288	142	257	115	229	321	353	(1,346)	(1,018)	(681)
income before income taxes	$ 1,511	$ 4,262	$ 4,275	$ 1,948	$ 6,466	$ 7,516	$ 6,159	$ 6,742	11,996	26,883	29,696
Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges									518
restructuring related charges									40
Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales									145,059	192,597	190,805
gross profit									22,904	38,797	43,065
selling, general, and administrative expenses									11,296	12,935	13,685
Income (loss) from operations									11,608	25,861	29,380
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales									135,654	131,128	118,739
gross profit									25,374	25,836	26,170
selling, general, and administrative expenses									14,551	14,881	15,079
Income (loss) from operations									10,823	10,956	11,091
Upholstery Fabrics [Member] \| Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
restructuring related charges									40
Home Accessories [Member]
Segment Reporting Information [Line Items]
net sales									15,956
gross profit									4,428
selling, general, and administrative expenses									5,163
Income (loss) from operations									(735)
Operating Segments [Member]
Segment Reporting Information [Line Items]
gross profit									52,706	64,633	69,235
selling, general, and administrative expenses									37,847	37,172	39,157
Income (loss) from operations									14,859	27,461	30,078
Other non-recurring charges									(159)
restructuring related charges									(2,349)
Operating Segments [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales									145,059	192,597	190,805
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales									135,654	131,128	118,739
restructuring credit and related charges									1,600
Operating Segments [Member] \| Upholstery Fabrics [Member] \| Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
restructuring related charges									40
Operating Segments [Member] \| Home Accessories [Member]
Segment Reporting Information [Line Items]
net sales									15,956
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
selling, general, and administrative expenses									6,837	9,356	10,393
Income (loss) from operations									(6,837)	$ (9,356)	$ (10,393)
Unallocated Corporate [Member] \| Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges									$ 429