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Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) - USD ($)
$ in Thousands
Oct. 29, 2017
Apr. 30, 2017
Oct. 30, 2016
Segment Reporting Information [Line Items]      
Property, plant and equipment $ 52,530 $ 51,651 [1] $ 45,537
United States [Member] | Mattress Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 35,800 34,000 28,500
United States [Member] | Upholstery Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 1,400 1,200 890
Canada [Member] | Mattress Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 14,200 14,900 14,700
China [Member] | Upholstery Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 722 655 590
Unallocated Corporate [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment [2] 502 856 829
Unallocated Corporate [Member] | United States [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment $ 502 $ 856 $ 829
[1] Derived from audited financial statements.
[2] The $502, $829, and $856 at October 29, 2017, October 30, 2016 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 corporate are located in the U.S.