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Commitments and Contingencies (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 01, 2014
Apr. 27, 2014
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Commitments and Contingencies Disclosure [Line Items]          
Rental expense for operating leases     $ 2,900,000 $ 2,700,000 $ 2,400,000
Future minimum rental commitments for noncancellable operating leases in fiscal 2016     2,600,000    
Future minimum rental commitments for noncancellable operating leases in fiscal 2017     1,500,000    
Future minimum rental commitments for noncancellable operating leases in fiscal 2018     645,000    
Future minimum rental commitments for noncancellable operating leases in fiscal 2019     76,000    
Future minimum rental commitments for noncancellable operating leases in fiscal 2020     $ 23,000    
Minimum [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Lease terms     3 years    
Maximum [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Lease terms     5 years    
Lease terms, renewal options for additional periods     9 years    
Mattress Fabrics [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Lease terms 3 years        
Monthly lease payments of a plant facility $ 13,000     12,704  
Mattress Fabrics [Member] | Plant facility [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Rental payments     $ 155,000 152,000 $ 152,000
Mattress Fabrics [Member] | Capital Addition Purchase Commitments [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Open purchase commitments   $ 3,400,000 $ 2,300,000 3,400,000  
Mattress Fabrics [Member] | First Lease Renewal Term [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        
Mattress Fabrics [Member] | Second Lease Renewal Term [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        
Settled Litigation [Member] | Environmental Issue [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Lawsuit filing date     February 5, 2008    
Payments made for settlement of lawsuit   $ 206,000      
Lawsuit dismissed date     Jun. 05, 2014    
Settled Litigation [Member] | Environmental Issue [Member] | Other Expense [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Charge resulted from settlement of lawsuit       $ 206,000  
Settled Litigation [Member] | Environmental Issue [Member] | Site of former manufacturing plant in West Hazleton, Pennsylvania [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Actions taken by court which impacted the lawsuit     The lawsuit involves court judgments that have been entered against the plaintiffs and against defendant Chromatex, Inc. requiring them to pay costs incurred by the United States Environmental Protection Agency ("USEPA") responding to environmental contamination at the Site, in amounts approximating $14 million, plus unspecified future environmental costs.    
Amount of judgment against plaintiffs for which recovery is being sought from defendants     $ 14,000,000    
Damages sought by plaintiffs     Costs incurred by the United States Environmental Protection Agency ("USEPA") responding to environmental contamination at the Site, in amounts approximating $14 million, plus unspecified future environmental costs