Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2022	Aug. 01, 2021	May 01, 2022
Segment Reporting Information [Line Items]
Accounts receivable	$ 24,812	$ 35,008	$ 22,226	[1]
Inventory	63,749	58,613	66,557	[1]
Cash and cash equivalents	18,874	26,061	14,550	[1]
Short-term investments - available for sale		9,698
Short-term investments - held-to-maturity		1,661
Current income taxes receivable	798	524	857	[1]
Other current assets	3,840	3,889	2,986	[1]
Deferred income taxes	546	455	528	[1]
Property, plant and equipment	40,490	43,930	41,702	[1]
Right of use assets	14,556	11,447	15,577	[1]
Intangible assets	2,534	2,910	2,628	[1]
Long-term investments - rabbi trust	9,567	8,841	9,357	[1]
Long-term investments - held-to-maturity		6,629
Other assets	724	2,582	595	[1]
Total assets	180,490	212,248	177,563	[1]
Capital expenditures	583	1,653
Depreciation expense	1,770	1,726
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	138,938	146,624	141,137
Depreciation expense	1,770	1,726
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Accounts receivable	12,382	18,016	9,865
Inventory	36,471	31,778	39,028
Property, plant and equipment	37,354	41,311	38,731
Right of use assets	3,232	4,058	3,469
Total assets	89,439	95,163	91,093
Capital expenditures	197	1,117
Depreciation expense	1,568	1,521
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Accounts receivable	12,430	16,992	12,361
Inventory	27,278	26,835	27,529
Property, plant and equipment	2,271	1,650	2,030
Right of use assets	7,520	5,984	8,124
Total assets	49,499	51,461	50,044
Capital expenditures	360	262
Depreciation expense	202	205
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	18,874	26,061	14,550
Short-term investments - available for sale		9,698
Short-term investments - held-to-maturity		1,661
Current income taxes receivable	798	524	857
Other current assets	3,840	3,889	2,986
Deferred income taxes	546	455	528
Property, plant and equipment	865	969	941
Right of use assets	3,804	1,405	3,984
Intangible assets	2,534	2,910	2,628
Long-term investments - rabbi trust	9,567	8,841	9,357
Long-term investments - held-to-maturity		6,629
Other assets	724	2,582	595
Total assets	180,490	212,248	$ 177,563
Capital expenditures	$ 26	$ 274

[1] Derived from audited financial statements.