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Derivative Instruments Located on Consolidated Balance Sheet (Detail) (USD $)
Apr. 20, 2013
Dec. 29, 2012
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 1,079,000 $ 9,000
Derivative Liabilities 8,256,000 4,060,000
Interest Rate Contracts | Other Current Liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 331,000 867,000
Commodity Contract | Other Current Liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 7,886,000 3,047
Commodity Contract | Other LongTerm Liabilities
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 39,000 146,000
Commodity Contract | Other Current Assets
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 1,015,000  
Commodity Contract | Other Long Term Assets
   
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 64,000 $ 9,000