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Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 01, 2020
Nov. 03, 2019
Nov. 01, 2020
Nov. 03, 2019
Segment Reporting Information [Line Items]        
net sales $ 76,851 $ 69,550 $ 141,315 $ 140,269
gross profit from continuing operations 14,261 13,526 24,162 25,938
selling, general, and administrative expenses 9,743 9,117 17,761 18,266
total income from continuing operations 4,518 4,409 6,401 7,707
restructuring credit       35
interest expense   (21) (51) (21)
interest income 59 258 117 518
other expense (680) (99) (1,046) (194)
income before income taxes from continuing operations 3,897 4,547 5,421 8,010
Mattress Fabrics [Member]        
Segment Reporting Information [Line Items]        
net sales 40,030 35,666 76,133 74,525
Upholstery Fabrics [Member]        
Segment Reporting Information [Line Items]        
net sales 36,821 33,884 65,182 65,744
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
net sales 76,851 69,550 141,315 140,269
gross profit from continuing operations 14,261 13,526 24,162 25,938
selling, general, and administrative expenses 9,743 9,117 17,761 18,266
total income from continuing operations     6,401 7,672
Operating Segments [Member] | Mattress Fabrics [Member]        
Segment Reporting Information [Line Items]        
net sales 40,030 35,666 76,133 74,525
gross profit from continuing operations 7,584 6,247 12,191 11,938
selling, general, and administrative expenses 3,202 2,953 5,964 6,025
total income from continuing operations 4,382 3,294 6,227 5,913
Operating Segments [Member] | Upholstery Fabrics [Member]        
Segment Reporting Information [Line Items]        
net sales 36,821 33,884 65,182 65,744
gross profit from continuing operations 6,677 7,279 11,971 14,000
selling, general, and administrative expenses 3,390 3,806 6,570 7,652
total income from continuing operations 3,287 3,473 5,401 6,348
Unallocated Corporate [Member]        
Segment Reporting Information [Line Items]        
selling, general, and administrative expenses 3,151 2,358 5,227 4,589
total income from continuing operations $ (3,151) $ (2,358) $ (5,227) $ (4,589)