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Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 02, 2020
Aug. 04, 2019
Segment Reporting Information [Line Items]    
net sales $ 64,464 $ 70,719
gross profit from continuing operations 9,901 12,412
selling, general, and administrative expenses 8,018 9,149
total income from continuing operations 1,883 3,298
restructuring credit   35
interest expense (51)  
interest income 58 260
other expense (366) (95)
income before income taxes from continuing operations 1,524 3,463
Mattress Fabrics [Member]    
Segment Reporting Information [Line Items]    
net sales 36,103 38,859
Upholstery Fabrics [Member]    
Segment Reporting Information [Line Items]    
net sales 28,361 31,860
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
net sales 64,464 70,719
gross profit from continuing operations 9,901 12,412
selling, general, and administrative expenses 8,018 9,149
total income from continuing operations 1,883 3,263
Operating Segments [Member] | Mattress Fabrics [Member]    
Segment Reporting Information [Line Items]    
net sales 36,103 38,859
gross profit from continuing operations 4,608 5,691
selling, general, and administrative expenses 2,763 3,071
total income from continuing operations 1,845 2,620
Operating Segments [Member] | Upholstery Fabrics [Member]    
Segment Reporting Information [Line Items]    
net sales 28,361 31,860
gross profit from continuing operations 5,293 6,721
selling, general, and administrative expenses 3,180 3,846
total income from continuing operations 2,113 2,875
Unallocated Corporate [Member]    
Segment Reporting Information [Line Items]    
selling, general, and administrative expenses 2,075 2,232
total income from continuing operations $ (2,075) $ (2,232)