Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) - USD ($)		May 02, 2021		May 03, 2020
Segment Reporting Information [Line Items]
property, plant, and equipment		$ 44,003,000		$ 43,147,000
Right of use assets		11,730,000		3,903,000
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment		41,264,000	[1]	40,682,000	[2]
Right of use assets		4,278,000	[3]	362,000	[4]
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment		1,925,000	[5]	1,633,000	[6]
Right of use assets		5,945,000	[7]	1,633,000	[8]
Operating Segments [Member] | United States [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment		28,400,000		27,700,000
Right of use assets		1,400,000		362,000
Operating Segments [Member] | United States [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment		1,100,000		1,200,000
Right of use assets		952,000		857,000
Operating Segments [Member] | Canada [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment		12,000,000.0		13,000,000.0
Right of use assets		400,000
Operating Segments [Member] | Haiti [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment		855,000
Right of use assets		2,400,000
Operating Segments [Member] | China [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment		850,000		471,000
Right of use assets		5,000,000.0		776,000
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment	[9]	814,000		832,000
Right of use assets	[10]	1,507,000		1,908,000
Unallocated Corporate [Member] | United States [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment		814,000		832,000
Right of use assets		$ 1,500,000		$ 1,900,000

[1] The $41.3 million as of May 2, 2021, represents property, plant, and equipment of $28.4 million, $12.0 million, and $855,000 located in the U.S., Canada, and Haiti, respectively.  

[2] The $40.7 million as of May 3, 2020, represents property, plant, and equipment of $27.7 million and $13.0 million located in the U.S. and Canada, respectively.  

[3] The $4.3 million as of May 2, 2021, represents right of use assets of $2.4 million, $1.4 million, and $400,000 located in Haiti, the U.S., and Canada, respectively.

[4] The $362,000 as of May 3, 2020, represents right of use assets located in the U.S.

[5] The $1.9 million as of May 2, 2021, represents property, plant, and equipment of $1.1 million and $850,000 located in the U.S. and China, respectively.  

[6] The $1.6 million as of May 3, 2020, represents property, plant, and equipment of $1.2 million and $471,000 located in the U.S. and China, respectively.

[7] The $5.9 million as of May 2, 2021, represents right of use assets of $5.0 million and $952,000 located in China and the U.S., respectively.

[8] The $1.6 million as of May 3, 2020, represents right of use assets of $857,000 and $776,000 located in the U.S. and China, respectively.

[9] The $814,000 as of May 2, 2021, and $832,000 as of May 3, 2020, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress fabrics and upholstery fabrics segments located in the U.S.

[10] The $1.5 million as of May 2, 2021, and $1.9 million as of May 3, 2020, represents right of use assets located in the U.S. associated with unallocated corporate departments and corporate departments shared by both the mattress fabrics and upholstery fabrics segments located in the U.S.