Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) - USD ($)		Jul. 30, 2023	Apr. 30, 2023		Jul. 31, 2022
Segment Reporting Information [Line Items]
Property, plant and equipment		$ 34,929,000	$ 36,111,000	[1]	$ 40,490,000
Right of use assets		7,466,000	8,191,000	[1]	14,556,000
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment	[2]	32,792,000	33,749,000		37,354,000
Right of use assets	[3]	2,139,000	2,308,000		3,232,000
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment	[4]	1,491,000	1,671,000		2,271,000
Right of use assets	[5]	2,237,000	2,618,000		7,520,000
Operating Segments [Member] | United States [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		22,100,000	22,700,000		24,700,000
Right of use assets					1,100,000
Operating Segments [Member] | United States [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		1,000,000	974,000		1,100,000
Right of use assets		977,000	1,100,000		1,600,000
Operating Segments [Member] | Canada [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		10,100,000	10,400,000		11,900,000
Right of use assets		720,000	776,000		228,000
Operating Segments [Member] | Ouanaminthe, Haiti [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		594,000	608,000		718,000
Right of use assets		1,400,000	1,500,000		1,900,000
Operating Segments [Member] | Ouanaminthe, Haiti [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		327,000	592,000		988,000
Right of use assets					2,500,000
Operating Segments [Member] | China [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		159,000	105,000		232,000
Right of use assets		1,200,000	1,500,000		3,400,000
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment	[6]	646,000	691,000		865,000
Right of use assets	[7]	3,090,000	3,265,000		3,804,000
Unallocated Corporate [Member] | United States [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		646,000	691,000		865,000
Right of use assets		$ 3,100,000	$ 3,300,000		$ 3,800,000

[1] Derived from audited consolidated financial statements.

[2] The $32.8 million as of July 30, 2023, represents property, plant, and equipment of $22.1 million, $10.1 million, and $594,000 located in the U.S., Canada, and Haiti, respectively. The $37.4 million as of July 31, 2022, represents property, plant, and equipment of $24.7 million, $11.9 million, and $718,000 located in the U.S., Canada, and Haiti, respectively. 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 $2.1 million as of July 30, 2023, represents right of use assets of $1.4 million and $720,000 located in Haiti and Canada, respectively. The $3.2 million as of July 31, 2022, represents right of use assets of $1.9 million, $1.1 million, and $228,000 located in Haiti, the U.S., and Canada, respectively. 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.

[4] The $1.5 million as of July 30, 2023, represents property, plant, and equipment of $1.0 million, $327,000, and $159,000 located in the U.S., Haiti, and China, respectively. The $2.3 million as of July 31, 2022, represents property, plant, and equipment of $1.1 million, $988,000, and $232,000 located in the U.S., Haiti, and China, respectively. 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.

[5] The $2.2 million as of July 30, 2023, represents right of use assets of $1.2 million and $977,000 located in China and the U.S., respectively. The $7.5 million as of July 31, 2022, represents right of use assets of $3.4 million, $2.5 million, and $1.6 million located in China, Haiti, and the U.S., respectively. 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.

[6] The $646,000, $865,000, and $691,000 as of July 30, 2023, July 31, 2022, and April 30, 2023, respectively, represent property, plant, and equipment associated with unallocated corporate department and corporate departments shared by our mattress fabrics and upholstery fabrics segments. Property, plant, and equipment associated with our corporate departments reside in the U.S.

[7] The $3.1 million, $3.8 million, and $3.3 million as of July 30, 2023, July 31, 2022, and April 30, 2023, respectively, represent right of use assets located in the U.S.