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Commitments and Contingencies (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
May 16, 2016
May 31, 2018
Apr. 30, 2016
Jul. 29, 2018
Apr. 29, 2018
Apr. 30, 2017
Jul. 30, 2017
Commitments and Contingencies Disclosure [Line Items]              
Accounts payable for capital expenditures       $ 862,000 $ 1,800,000   $ 5,600,000
Buildings and Improvements [Member]              
Commitments and Contingencies Disclosure [Line Items]              
Amount financed for construction of building         1,400,000   $ 3,900,000
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member]              
Commitments and Contingencies Disclosure [Line Items]              
Open purchase commitments       $ 1,700,000      
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%