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Commitments and Contingencies (Detail) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
May 16, 2016
Apr. 30, 2016
Jan. 28, 2018
Apr. 30, 2017
Jan. 29, 2017
Commitments and Contingencies Disclosure [Line Items]          
Accounts payable for capital expenditures     $ 1,600,000 $ 6,100,000 $ 5,600,000
Buildings and Improvements [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Amount financed for construction of building     1,400,000 5,100,000 $ 4,500,000
Amount financed for construction of building required to be paid in fiscal 2019     1,400,000    
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Open purchase commitments     4,100,000    
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | Buildings and Improvements [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Open purchase commitments     $ 1,400,000    
Contractual obligation, current cost $ 11,300,000        
Contractual obligation paid   $ 1,900,000   $ 4,300,000  
Contractual obligation due in fiscal 2018 3,700,000        
Contractual obligation due in fiscal 2019 1,400,000        
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%