Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($)		3 Months Ended
		Aug. 01, 2021	Aug. 02, 2020	May 02, 2021
Segment Reporting Information [Line Items]
Accounts receivable		$ 35,008,000	$ 29,893,000	$ 37,726,000	[1]
Inventory		58,613,000	40,402,000	55,917,000	[1]
Cash and cash equivalents		26,061,000	39,986,000	37,009,000	[1]
Short-term investments - available for sale		9,698,000	983,000	5,542,000	[1]
Short-term investments - held-to-maturity		1,661,000	5,092,000	3,161,000	[1]
Current income taxes receivable		524,000	782,000
Other current assets		3,889,000	3,547,000	3,852,000	[1]
Deferred income taxes		455,000	593,000	545,000	[1]
Property, plant and equipment		43,930,000	42,051,000	44,003,000	[1]
Right of use assets		11,447,000	6,443,000	11,730,000	[1]
Intangible assets		2,910,000	3,286,000	3,004,000	[1]
Long-term investments - rabbi trust		8,841,000	7,916,000	8,415,000	[1]
Long-term investments - held-to-maturity		6,629,000	1,314,000	1,141,000	[1]
Other assets		2,582,000	540,000	2,035,000	[1]
Investment in unconsolidated joint venture			1,759,000
Total assets		212,248,000	184,587,000	214,080,000	[1]
Capital expenditures	[2]	1,653,000	726,000
Depreciation expense		1,726,000	1,822,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets		146,624,000	117,919,000	147,055,000
Depreciation expense		1,726,000	1,822,000
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Accounts receivable		18,016,000	15,585,000	20,427,000
Inventory		31,778,000	20,070,000	30,047,000
Property, plant and equipment	[3]	40,881,000	39,597,000	41,264,000
Right of use assets	[4]	4,058,000	832,000	4,278,000
Investment in unconsolidated joint venture			1,759,000
Total assets		94,733,000	77,843,000	96,016,000
Capital expenditures	[2]	1,117,000	545,000
Depreciation expense		1,521,000	1,631,000
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Accounts receivable		16,992,000	14,308,000	17,299,000
Inventory		26,835,000	20,332,000	25,870,000
Property, plant and equipment	[5]	2,080,000	1,634,000	1,925,000
Right of use assets	[6]	5,984,000	3,802,000	5,945,000
Total assets		51,891,000	40,076,000	51,039,000
Capital expenditures	[2]	262,000	113,000
Depreciation expense		205,000	191,000
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		26,061,000	39,986,000	37,009,000
Short-term investments - available for sale		9,698,000	983,000	5,542,000
Short-term investments - held-to-maturity		1,661,000	5,092,000	3,161,000
Current income taxes receivable		524,000	782,000
Other current assets		3,889,000	3,547,000	3,852,000
Deferred income taxes		455,000	593,000	545,000
Property, plant and equipment	[7]	969,000	820,000	814,000
Right of use assets	[8]	1,405,000	1,809,000	1,507,000
Intangible assets		2,910,000	3,286,000	3,004,000
Long-term investments - rabbi trust		8,841,000	7,916,000	8,415,000
Long-term investments - held-to-maturity		6,629,000	1,314,000	1,141,000
Other assets		2,582,000	540,000	2,035,000
Total assets		212,248,000	184,587,000	$ 214,080,000
Capital expenditures	[2]	$ 274,000	$ 68,000

[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 $40.9 million as of August 1, 2021, represents property, plant, and equipment of $27.6 million, $12.4 million, and $875,000 located in the U.S., Canada, and Haiti, respectively. The $39.6 million as of August 2, 2020, represents property, plant, and equipment of $27.0 million and $12.6 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 $4.1 million as of August 1, 2021, represents right of use assets of $2.3 million, $1.4 million, and $355,000 located in Haiti, the U.S., and Canada, respectively.  The $832,000 as of August 2, 2020, represents right of use assets of $535,000 and $297,000 located in Canada and the U.S., 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 $2.1 million as of August 1, 2021, represents property, plant, and equipment of $1.1 million, $830,000, and $130,000 located in the U.S., China, and Haiti, respectively. The $1.6 million as of August 2, 2020, represents property, plant, and equipment of $1.2 million and $456,000 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 $6.0 million as of August 1, 2021, represents right of use assets of $4.6 million and $1.4 million located in China and the U.S., respectively.  The $3.8 million as of August 2, 2020, represents right of use assets of $3.1 million and $710,000 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 $969,000, $820,000, and $814,000 as of August 1, 2021, August 2, 2020, 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 $1.4 million, $1.8 million, and $1.5 million as of August 1, 2021, August 2, 2020, and May 2, 2021, respectively, represent right of use assets located in the U.S.