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Commitments and Contingencies (Detail) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
May 16, 2016
May 31, 2018
Apr. 30, 2016
Jan. 27, 2019
Apr. 29, 2018
Apr. 30, 2017
Jan. 28, 2018
Commitments and Contingencies Disclosure [Line Items]              
Accounts payable for capital expenditures       $ 91,000 $ 1,800,000   $ 1,600,000
Buildings and Improvements [Member]              
Commitments and Contingencies Disclosure [Line Items]              
Amount financed for construction of building         1,400,000   $ 1,400,000
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member]              
Commitments and Contingencies Disclosure [Line Items]              
Open purchase commitments       $ 632,000      
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | Buildings and Improvements [Member]              
Commitments and Contingencies Disclosure [Line Items]              
Contractual obligation, current cost $ 11,300,000            
Contractual obligation paid   $ 1,400,000 $ 1,900,000   $ 3,700,000 $ 4,300,000  
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | Buildings and Improvements [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Commitments and Contingencies Disclosure [Line Items]              
Percentage rate added to variable rate 2.25%            
Variable interest rate       30-day LIBOR rate      
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | Buildings and Improvements [Member] | Letter of Credit [Member]              
Commitments and Contingencies Disclosure [Line Items]              
Letter of credit $ 5,000,000            
Unused fee calculated on letter of credit 0.10%