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Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jan. 28, 2018
Apr. 30, 2017
Jan. 29, 2017
Segment Reporting Information [Line Items]      
Property, plant and equipment $ 51,838 $ 51,651 [1] $ 50,333
United States [Member] | Mattress Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 35,600 34,000 32,600
United States [Member] | Upholstery Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 1,400 1,200 1,100
Canada [Member] | Mattress Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 13,700 14,900 15,200
China [Member] | Upholstery Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 711 655 711
Unallocated Corporate [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment [2] 448 856 752
Unallocated Corporate [Member] | United States [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment $ 448 $ 856 $ 752
[1] Derived from audited financial statements.
[2] The $448, $752, and $856 at January 28, 2018, January 29, 2017 and April 30, 2017, respectively, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress and upholstery fabric segments. Property, plant, and equipment associated with our corporate departments are located in the U.S.