Segment Information - Financial Information for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 27, 2019	Jan. 28, 2018	Jan. 27, 2019	Jan. 28, 2018
Segment Reporting Information [Line Items]
Net Sales	$ 77,226	$ 85,310	$ 225,705	$ 245,541
Gross profit	14,123	17,603	38,008	49,873
Selling, general, and administrative expenses	10,038	9,959	28,174	28,876
Income from operations	4,299	7,644	10,659	20,997
Interest expense	0	(31)	(38)	(69)
Interest income	251	132	552	391
Other expense	(288)	(229)	(688)	(903)
Income before income taxes	4,262	7,516	10,485	20,416
Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges			518
Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Net Sales	35,732		107,335
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Net Sales	37,104		106,611
Restructuring credit and related charges			(1,563)
Upholstery Fabrics [Member] \| Cost of Sales [Member]
Segment Reporting Information [Line Items]
Restructuring related charges			2,349
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	4,390		11,759
Operating Segments [Member]
Segment Reporting Information [Line Items]
Gross profit	14,637	17,603	40,516	49,873
Selling, general, and administrative expenses	9,569	9,959	27,616	28,876
Income from operations	5,068	7,644	12,900	20,997
Other non-recurring charges			678
Operating Segments [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Net Sales	35,732	49,042	107,335	146,072
Gross profit	5,963	10,146	17,050	29,641
Selling, general, and administrative expenses	2,755	3,309	8,141	9,868
Income from operations	3,208	6,837	8,910	19,774
Operating Segments [Member] \| Mattress Fabrics [Member] \| Cost of Sales [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges			159
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Net Sales	37,104	36,268	106,611	99,469
Gross profit	7,624	7,457	20,031	20,232
Restructuring related charges	554		2,400
Selling, general, and administrative expenses	3,825	3,947	10,985	11,458
Income from operations	3,799	3,510	9,044	8,773
Restructuring credit and related charges	(340)		(1,563)
Operating Segments [Member] \| Upholstery Fabrics [Member] \| Cost of Sales [Member]
Segment Reporting Information [Line Items]
Restructuring related charges	514		2,349
Operating Segments [Member] \| Upholstery Fabrics [Member] \| Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Restructuring related charges	40		40
Operating Segments [Member] \| Home Accessories [Member]
Segment Reporting Information [Line Items]
Net Sales	4,390		11,759
Gross profit	1,050		3,435
Selling, general, and administrative expenses	1,361		3,690
Income from operations	(311)		(254)
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	1,628	2,703	4,800	7,550
Income from operations	(1,628)	$ (2,703)	(4,800)	$ (7,550)
Other non-recurring charges	429
Unallocated Corporate [Member] \| Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Other non-recurring charges	$ 429		$ 429

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