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Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jul. 30, 2017
Apr. 30, 2017
Jul. 31, 2016
Segment Reporting Information [Line Items]      
Property, plant and equipment $ 52,912 $ 51,651 [1] $ 41,745
United States [Member] | Mattress Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 35,800 34,000 25,500
United States [Member] | Upholstery Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 1,200 1,200 847
Canada [Member] | Mattress Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 14,500 14,900 13,900
China [Member] | Upholstery Fabrics [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment 684 655 612
Unallocated Corporate [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment [2] 785 856 851
Unallocated Corporate [Member] | United States [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment $ 785 $ 856 $ 851
[1] Derived from audited financial statements.
[2] The $785, $851, and $856 at July 30, 2017, July 31, 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.