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Exit and Disposal Activity - Summary of Restructuring Credit and Related Charges Associated with Exit and Disposal Activity (Parenthetical) (Detail) - USD ($)
3 Months Ended 9 Months Ended
Feb. 02, 2020
Jan. 27, 2019
Feb. 02, 2020
Jan. 27, 2019
Restructuring credit $ 35,000 $ 214,000 $ 70,000 $ 825,000
Upholstery Fabrics [Member]        
Restructuring credit   214,000 $ 70,000 825,000
Restructuring Related Charges   554,000    
Upholstery Fabrics [Member] | Cost of Sales [Member]        
Restructuring Related Charges   $ 514,000   2,300,000
Upholstery Fabrics [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Related Charges       $ 40,000