Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) - USD ($)		Apr. 28, 2024		Apr. 30, 2023
Segment Reporting Information [Line Items]
Property, plant and equipment		$ 33,182,000		$ 36,111,000
Right of use assets		6,203,000		8,191,000
Business Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		31,472,000	[1]	33,749,000	[2]
Right of use assets		1,627,000	[3]	2,308,000	[4]
Business Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		1,125,000	[5]	1,671,000	[6]
Right of use assets		1,952,000	[7]	2,618,000	[8]
Business Segments [Member] | United States [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		21,500,000		22,700,000
Business Segments [Member] | United States [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		1,000,000		974,000
Right of use assets		1,300,000		1,100,000
Business Segments [Member] | Canada [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		9,400,000		10,400,000
Right of use assets		545,000		776,000
Business Segments [Member] | Haiti [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		555,000		608,000
Right of use assets		1,100,000		1,500,000
Business Segments [Member] | Haiti [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment				592,000
Business Segments [Member] | China [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		120,000		105,000
Right of use assets		709,000		1,500,000
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment	[9]	585,000		691,000
Right of use assets	[10]	2,624,000		3,265,000
Unallocated Corporate [Member] | United States [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		585,000		691,000
Right of use assets		$ 2,600,000		$ 3,300,000

[1] The $31.5 million as of April 28, 2024, represents property, plant, and equipment of $21.5 million, $9.4 million, and $555,000 located in the U.S., Canada, and Haiti, respectively.

[2] The $33.7 million as of April 30, 2023, represents property, plant, and equipment of $22.7 million, $10.4 million, and $608,000 located in the U.S., Canada, and Haiti, respectively.

[3] The $1.6 million as of April 28, 2024, represents right of use assets of $1.1 million and $545,000 located in Haiti and Canada, respectively.

[4] The $2.3 million as of April 30, 2023, represents right of use assets of $1.5 million and $776,000 located in Haiti and Canada, respectively.

[5] The $1.1 million as of April 28, 2024, represents property, plant, and equipment of $1.0 million and $120,000 located in the U.S. and China, respectively.

[6] The $1.7 million as of April 30, 2023, represents property, plant, and equipment of $974,000, $592,000, and $105,000 located in the U.S., Haiti, and China, respectively.

[7] The $2.0 million as of April 28, 2024, represents right of use assets of $1.3 million and $709,000 located in the U.S. and China, respectively.

[8] The $2.6 million as of April 30, 2023, represents right of use assets of $1.5 million and $1.1 million located in China and the U.S., respectively.

[9] The $585,000 as of April 28, 2024, and $691,000 as of April 30, 2023, 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 $2.6 million as of April 28, 2024, and $3.3 million as of April 30, 2023, represent right of use assets associated with unallocated corporate departments and corporate departments shared by both the mattress fabrics and upholstery fabrics segments located in the U.S.