Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($)		9 Months Ended
		Jan. 30, 2022	Jan. 31, 2021	May 02, 2021
Segment Reporting Information [Line Items]
Accounts receivable, net		$ 38,998,000	$ 36,397,000	$ 37,726,000	[1]
Inventory		73,133,000	57,794,000	55,917,000	[1]
Cash and cash equivalents		11,780,000	35,987,000	37,009,000	[1]
Short-term investments - available for sale		438,000	5,548,000	5,542,000	[1]
Short-term investments - held-to-maturity		1,315,000	9,785,000	3,161,000	[1]
Current income taxes receivable		367,000
Other current assets		4,419,000	3,116,000	3,852,000	[1]
Deferred income taxes		500,000	640,000	545,000	[1]
Property, plant and equipment		42,778,000	42,385,000	44,003,000	[1]
Right of use assets		16,595,000	6,206,000	11,730,000	[1]
Intangible assets		2,722,000	3,098,000	3,004,000	[1]
Long-term investments - rabbi trust		9,223,000	8,232,000	8,415,000	[1]
Long-term investments - held-to-maturity		8,677,000	512,000	1,141,000	[1]
Other assets		622,000	555,000	2,035,000	[1]
Investment in unconsolidated joint venture			1,723,000
Total assets		211,567,000	211,978,000	214,080,000	[1]
Capital expenditures	[2]	4,973,000	4,453,000
Depreciation expense		5,203,000	5,203,000
Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Right of use assets		2,800,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets		166,495,000	142,013,000	147,055,000
Depreciation expense		5,203,000	5,203,000
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Accounts receivable, net		17,617,000	17,722,000	20,427,000
Inventory		39,544,000	30,326,000	30,047,000
Property, plant and equipment	[3]	39,483,000	39,550,000	41,264,000
Right of use assets	[4]	3,706,000	1,077,000	4,278,000
Investment in unconsolidated joint venture			1,723,000
Total assets		100,350,000	90,398,000	96,016,000
Capital expenditures	[2]	2,828,000	3,886,000
Depreciation expense		4,613,000	4,579,000
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Accounts receivable, net		21,381,000	18,675,000	17,299,000
Inventory		33,589,000	27,468,000	25,870,000
Property, plant and equipment	[5]	2,448,000	1,953,000	1,925,000
Right of use assets	[6]	8,727,000	3,519,000	5,945,000
Total assets		66,145,000	51,615,000	51,039,000
Capital expenditures	[2]	815,000	259,000
Depreciation expense		590,000	624,000
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		11,780,000	35,987,000	37,009,000
Short-term investments - available for sale		438,000	5,548,000	5,542,000
Short-term investments - held-to-maturity		1,315,000	9,785,000	3,161,000
Current income taxes receivable		367,000
Other current assets		4,419,000	3,116,000	3,852,000
Deferred income taxes		500,000	640,000	545,000
Property, plant and equipment	[7]	847,000	882,000	814,000
Right of use assets	[8]	4,162,000	1,610,000	1,507,000
Intangible assets		2,722,000	3,098,000	3,004,000
Long-term investments - rabbi trust		9,223,000	8,232,000	8,415,000
Long-term investments - held-to-maturity		8,677,000	512,000	1,141,000
Other assets		622,000	555,000	2,035,000
Total assets		211,567,000	211,978,000	$ 214,080,000
Capital expenditures	[2]	$ 1,330,000	$ 308,000

[1] Derived from audited financial statements.

[2] Capital expenditure amounts are stated on the accrual basis. See Consolidated Statements of Cash Flows for capital expenditure amounts on a cash basis.

[3] The $39.5 million as of January 30, 2022, represents property, plant, and equipment of $26.2 million, $12.5 million, and $796,000 located in the U.S., Canada, and Haiti, respectively. The $39.6 million as of January 31, 2021, represents property, plant, and equipment of $27.3 million and $12.3 million located in the U.S. and Canada, respectively.   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.

[4] The $3.7 million as of January 30, 2022, represents right of use assets of $2.1 million, $1.3 million, and $352,000 located in Haiti, the U.S., and Canada, respectively.  The $1.1 million as of January 31, 2021, represents right of use assets of $632,000 and $445,000 located in the U.S. and Canada, respectively.  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.  

[5] The $2.4 million as of January 30, 2022, represents property, plant, and equipment of $1.1 million, $774,000 and $585,000 located in the U.S., China, and Haiti, respectively. The $2.0 million as of January 31, 2021, represents property, plant, and equipment of $1.1 million and $881,000 located in the U.S. and China, respectively. 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 $8.7 million as of January 30, 2022, represents right of use assets of $4.1 million, $2.7 million, and $1.9 million located in China, Haiti, and the U.S., respectively.  The $3.5 million as of January 31, 2021, represents right of use assets of $2.4 million and $1.1 million located in China and the U.S., respectively.  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.

[7] The $847,000, $882,000, and $814,000 as of January 30, 2022, January 31, 2021, and May 2, 2021, respectively, represent property, plant, and equipment associated with unallocated corporate departments 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.

[8] The $4.2 million, $1.6 million, and $1.5 million as of January 30, 2022, January 31, 2021, and May 2, 2021, respectively, represent right of use assets located in the U.S.