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Commitments and Contingencies (Detail) (USD $)
 3 Months Ended
Jul. 28, 2013
Mattress Fabrics [Member]
Capital Addition Purchase Commitments [Member]
Apr. 28, 2013
Mattress Fabrics [Member]
Capital Addition Purchase Commitments [Member]
Jul. 28, 2013
Pending Litigation [Member]
Environmental Issue [Member]
Jul. 28, 2013
Pending Litigation [Member]
Environmental Issue [Member]
Site of former manufacturing plant in West Hazleton, Pennsylvania [Member]
Jul. 28, 2013
Pending Litigation [Member]
Other Expense [Member]
Environmental Issue [Member]
Commitments and Contingencies Disclosure [Line Items]          
Lawsuit filing date     February 5, 2008    
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 $8.6 million, plus unspecified future environmental costs.  
Amount of judgment against plaintiffs for which recovery is being sought from defendants       $ 8,600,000  
Site maximum loss exposure representing contamination clean up costs incurred by the United States Environmental Protection Agency       13,000,000  
Damages sought by plaintiffs       Costs incurred by the United States Environmental Protection Agency ("USEPA") responding to environmental contamination at the Site, in amounts approximating $8.6 million, plus unspecified future environmental costs  
Charge resulted from tentative settlement of lawsuit         206,000
Open purchase commitments $ 403,000 $ 170,000