Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($) $ in Thousands	6 Months Ended
	Oct. 30, 2022	Oct. 31, 2021	May 01, 2022
Segment Reporting Information [Line Items]
Accounts receivable	$ 22,443	$ 32,316	$ 22,226	[1]
Inventory	52,224	63,781	66,557	[1]
Cash and cash equivalents	19,137	16,956	14,550	[1]
Short-term investments - available for sale		9,709
Short-term investments - held-to-maturity		1,564
Short-term investments - rabbi trust	2,237
Current income taxes receivable	510	613	857	[1]
Other current assets	3,462	3,811	2,986	[1]
Deferred income taxes	493	452	528	[1]
Property, plant and equipment	38,832	43,265	41,702	[1]
Right of use assets	11,609	13,649	15,577	[1]
Intangible assets	2,440	2,816	2,628	[1]
Long-term investments - rabbi trust	7,526	9,036	9,357	[1]
Long-term investments - held-to-maturity		8,353
Other assets	717	3,004	595	[1]
Total assets	161,630	209,325	177,563	[1]
Capital expenditures	774	3,729
Depreciation expense	3,489	3,471
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	120,655	147,760	141,137
Depreciation expense	3,489	3,471
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Accounts receivable	8,700	16,639	9,865
Inventory	30,300	34,498	39,028
Property, plant and equipment	35,853	40,673	38,731
Right of use assets	2,087	3,838	3,469
Total assets	76,940	95,648	91,093
Capital expenditures	267	2,030
Depreciation expense	3,088	3,071
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Accounts receivable	13,743	15,677	12,361
Inventory	21,924	29,283	27,529
Property, plant and equipment	2,150	1,680	2,030
Right of use assets	5,898	5,472	8,124
Total assets	43,715	52,112	50,044
Capital expenditures	447	397
Depreciation expense	401	400
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	19,137	16,956	14,550
Short-term investments - available for sale		9,709
Short-term investments - held-to-maturity		1,564
Short-term investments - rabbi trust	2,237
Current income taxes receivable	510	613	857
Other current assets	3,462	3,811	2,986
Deferred income taxes	493	452	528
Property, plant and equipment	829	912	941
Right of use assets	3,624	4,339	3,984
Intangible assets	2,440	2,816	2,628
Long-term investments - rabbi trust	7,526	9,036	9,357
Long-term investments - held-to-maturity		8,353
Other assets	717	3,004	595
Total assets	161,630	209,325	$ 177,563
Capital expenditures	$ 60	$ 1,302

[1] Derived from audited financial statements.