Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($)		3 Months Ended								12 Months Ended
		May 03, 2020	Feb. 02, 2020	Nov. 03, 2019	Aug. 04, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	May 03, 2020		Apr. 28, 2019	Apr. 29, 2018
Segment Reporting Information [Line Items]
net sales		$ 47,378,000	$ 68,518,000	$ 69,550,000	$ 70,719,000	$ 67,023,000	$ 73,127,000	$ 72,275,000	$ 68,898,000	$ 256,166,000		$ 281,325,000	$ 323,725,000
Gross profit from continuing operations		3,045,000	11,520,000	13,526,000	12,412,000	11,195,000	13,073,000	11,609,000	9,900,000	40,498,000		45,769,000	64,633,000
other non-recurring charges	[1],[2]											(678,000)
Selling, general, and administrative expenses		7,327,000	8,831,000	9,117,000	9,149,000	8,758,000	8,677,000	8,409,000	7,397,000	34,424,000		33,243,000	37,172,000
(loss) income from continuing operations		(17,994,000)	2,724,000	4,409,000	3,298,000	2,437,000	4,610,000	4,261,000	2,052,000	(7,568,000)		13,351,000	27,461,000
asset impairments		(13,712,000)								(13,712,000)	[3]
restructuring credit and related charges	[4],[5]									70,000		(1,563,000)
interest expense		(84,000)		(21,000)				(14,000)	(17,000)	(106,000)		(35,000)	(94,000)
interest income		121,000	258,000	258,000	260,000	221,000	259,000	155,000	150,000	897,000		789,000	534,000
other expense		(426,000)	(282,000)	(99,000)	(95,000)	(670,000)	(294,000)	(164,000)	(254,000)	(902,000)		(1,383,000)	(1,018,000)
(loss) income before income taxes from continuing operations		$ (18,383,000)	$ 2,700,000	$ 4,547,000	$ 3,463,000	$ 1,988,000	$ 4,575,000	$ 4,238,000	$ 1,931,000	(7,679,000)		12,722,000	26,883,000
Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
other non-recurring charges												(518,000)
restructuring related charges												(40,000)
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales										124,754,000		135,654,000
asset impairments										(2,200,000)
restructuring credit and related charges	[6],[7]									70,000		(1,563,000)
Upholstery Fabrics [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
restructuring related charges												(40,000)
Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales										131,412,000		145,671,000
asset impairments										(11,500,000)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Gross profit from continuing operations										40,498,000		48,277,000	64,633,000
Selling, general, and administrative expenses										34,424,000		32,685,000	37,172,000
(loss) income from continuing operations										6,074,000		15,592,000	27,461,000
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales										124,754,000		135,654,000	131,128,000
Gross profit from continuing operations										24,220,000		25,373,000	25,836,000
restructuring related charges	[8]											(2,349,000)
Selling, general, and administrative expenses										14,353,000		14,551,000	14,881,000
(loss) income from continuing operations										9,867,000		10,823,000	10,956,000
restructuring credit and related charges												(1,600,000)
Operating Segments [Member] | Upholstery Fabrics [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
restructuring related charges	[9]											40,000
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales										131,412,000		145,671,000	192,597,000
Gross profit from continuing operations										16,278,000		22,904,000	38,797,000
other non-recurring charges	[1]											(159,000)
Selling, general, and administrative expenses										11,354,000		11,296,000	12,935,000
(loss) income from continuing operations										4,924,000		11,607,000	25,861,000
Operating Segments [Member] | Mattress Fabrics [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
other non-recurring charges	[2]											518,000
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses										8,717,000		6,838,000	9,356,000
(loss) income from continuing operations										$ (8,717,000)		(6,838,000)	$ (9,356,000)
Unallocated Corporate [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
other non-recurring charges												$ (429,000)

[1] The $159 represents employee termination benefits and other operational reorganization costs associated with our mattress fabrics segment.

[2] The $518 represents a non-recurring charge of $429 for the accelerated vesting of certain stock-based compensation agreements associated with a senior executive and was recorded in unallocated corporate expenses. Additionally, the $518 includes $89 for employee termination benefits and operational reorganizational costs associated with our mattress fabrics segment.

[3] During fiscal 2020, we incurred asset impairment charges totaling $13.7 million, of which $13.6 million and $143,000 were associated with goodwill and a tradename associated Read, respectively. Of this $13.7 million, $11.5 million and $2.2 million pertained to the mattress fabrics segment and upholstery fabrics segment, respectively.

[4] Of this total net charge, a charge of $2.3 million, a charge of $40, and a credit of $825 were recorded in cost of sales, selling, general, and administrative expenses, and restructuring credit, respectively, in the fiscal 2019 Consolidated Statement of Net Income.

[5] The $1.6 million represent charges and credits that were associated our closed Anderson, SC upholstery fabrics facility and include $1.6 million for inventory markdowns, $784 for other operating costs, $661 for employee termination benefits, and $40 for the accelerated vesting of certain stock-based compensation agreements associated an employee, partially offset by a $1.5 million gain on the sale of property, plant, and equipment.

[6] Of the total net charge, a $2.3 million charge, a charge of $40,000, and a credit of $825,000 were recorded in cost of sales, selling, general and administrative expenses, and restructuring credit, respectively, in the accompanying fiscal 2019 Consolidated Statement of Net Income.

[7] The $70,000 credit was recorded to restructuring credit in the accompanying fiscal 2020 Consolidated Statement of Net Loss.

[8] The $2.3 million represents a restructuring related charge of $1.6 million for inventory markdowns and $784 for other operating costs associated with our closed Anderson, SC upholstery fabrics facility.

[9] The $40 represents a restructuring related charge for the accelerated vesting for certain stock-based compensation agreements associated with an employee that was located at our closed Anderson, SC upholstery fabrics facility.