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Commitments and Contingencies (Detail) - USD ($)
1 Months Ended 12 Months Ended
May 16, 2016
Oct. 01, 2014
Apr. 30, 2016
Apr. 30, 2017
May 01, 2016
May 03, 2015
Commitments and Contingencies Disclosure [Line Items]            
Rental expense for operating leases       $ 2,900,000 $ 3,000,000 $ 2,900,000
Future minimum rental commitments for noncancellable operating leases in fiscal 2018       2,200,000    
Future minimum rental commitments for noncancellable operating leases in fiscal 2019       1,300,000    
Future minimum rental commitments for noncancellable operating leases in fiscal 2020       911,000    
Future minimum rental commitments for noncancellable operating leases in fiscal 2021       127,000    
Future minimum rental commitments for noncancellable operating leases in fiscal 2022       78,000    
Accounts payable for capital expenditures       6,100,000    
Accounts payable for capital expenditures, current       4,767,000 224,000  
Accounts payable for capital expenditures, noncurrent       1,322,000    
buildings and improvements [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Amount financed for construction of building       5,100,000    
Equipment [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Accounts payable for capital expenditures, current         224,000  
Mattress Fabrics [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Lease terms   3 years        
Monthly lease payments of a plant facility   $ 13,000        
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Open purchase commitments       7,200,000    
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member] | buildings and improvements [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Open purchase commitments       5,100,000    
Contractual obligation, current cost $ 11,300,000          
Contractual obligation paid     $ 1,900,000 $ 4,300,000    
Contractual obligation due in fiscal 2018 3,800,000          
Contractual obligation due in fiscal 2019 1,300,000          
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%          
Mattress Fabrics [Member] | Plant facility [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Rental payments       $ 156,000 $ 156,000 $ 155,000
First Lease Renewal Term [Member] | Mattress Fabrics [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Lease terms, renewal options for additional periods   3 years        
Monthly lease payments of a plant facility   $ 13,100        
Second Lease Renewal Term [Member] | Mattress Fabrics [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Lease terms, renewal options for additional periods   3 years        
Monthly lease payments of a plant facility   $ 13,200        
Minimum [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Lease terms       1 year    
Maximum [Member]            
Commitments and Contingencies Disclosure [Line Items]            
Lease terms       5 years    
Lease terms, renewal options for additional periods       9 years