Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($)		12 Months Ended
		May 02, 2021	May 03, 2020	Apr. 28, 2019
Segment Reporting Information [Line Items]
net sales		$ 299,720,000	$ 256,166,000	$ 281,325,000
Gross profit from continuing operations		49,832,000	40,498,000	45,769,000
other non-recurring charges	[1],[2]			(678,000)
restructuring and related charges	[3],[4]		70,000	(1,563,000)
Selling, general and administrative expenses		37,756,000	34,424,000	33,243,000
(loss) income from continuing operations		12,076,000	(7,568,000)	13,351,000
asset impairments	[5]		(13,712,000)
interest expense		(51,000)	(106,000)	(35,000)
interest income		244,000	897,000	789,000
gain on bargain purchase	[6]	819,000
other expense		(2,208,000)	(902,000)	(1,383,000)
income (loss) before income taxes from continuing operations		10,880,000	(7,679,000)	12,722,000
Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
other non-recurring charges				(518,000)
restructuring and related charges				(40,000)
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales		142,049,000	124,754,000	135,654,000
restructuring and related charges				(1,600,000)
asset impairments			(2,200,000)
Upholstery Fabrics [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
restructuring and related charges				(40,000)
Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales		157,671,000	131,412,000	145,671,000
asset impairments			(11,500,000)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Gross profit from continuing operations		49,832,000	40,498,000	48,277,000
Selling, general and administrative expenses		37,756,000	34,424,000	32,685,000
(loss) income from continuing operations		12,076,000	6,074,000	15,592,000
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales		142,049,000	124,754,000	135,654,000
Gross profit from continuing operations		25,968,000	24,220,000	25,373,000
restructuring and related charges	[7]			(2,349,000)
Selling, general and administrative expenses		14,092,000	14,353,000	14,551,000
(loss) income from continuing operations		11,876,000	9,867,000	10,823,000
Operating Segments [Member] | Upholstery Fabrics [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
restructuring and related charges	[8]			40,000
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales		157,671,000	131,412,000	145,671,000
Gross profit from continuing operations		23,864,000	16,278,000	22,904,000
other non-recurring charges	[1]			(159,000)
Selling, general and administrative expenses		12,066,000	11,354,000	11,296,000
(loss) income from continuing operations		11,798,000	4,924,000	11,607,000
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		11,598,000	8,717,000	6,838,000
(loss) income from continuing operations		$ (11,598,000)	$ (8,717,000)	(6,838,000)
Unallocated Corporate [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
other non-recurring charges				$ (429,000)

[1] The $159,000 represents employee termination benefits and other operational reorganization costs associated with our mattress fabrics segment.

[2] The $518,000 represents a non-recurring charge of $429,000 for the accelerated vesting of certain stock-based compensation agreements associated with a senior executive and was recorded in unallocated corporate expenses. Additionally, the $518,000 includes $89,000 for employee termination benefits and operational reorganizational costs associated with our mattress fabrics segment.

[3] Of this total net charge of $1.6 million, a charge of $2.3 million, 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 fiscal 2019 Consolidated Statement of Net Income.

[4] 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, $784,000 for other operating costs, $661,000 for employee termination benefits, and $40,000 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.

[5] During fiscal 2020, we incurred asset impairment charges totaling $13.7 million, of which $13.6 million and $143,000 pertained to goodwill associated with our mattress and upholstery fabric segments 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.

[6] Effective February 1, 2021, we acquired the remaining fifty percent ownership interest in our former unconsolidated joint venture located in Haiti.  Pursuant to this transaction, we are now the sole owner with full control over this operation.  The gain on bargain purchase represents the net assets acquired from this transaction that were more than the $954,000 total purchase price.

[7] The $2.3 million represents a restructuring related charge of $1.6 million for inventory markdowns and $784,000 for other operating costs associated with our closed Anderson, SC upholstery fabrics facility.

[8] The $40,000 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.