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Net Fair Value of Commodity Price Risk (Detail) (USD $)
In Millions, unless otherwise specified
Oct. 04, 2014
Derivatives, Fair Value [Line Items]  
Liabilities $ (27.1)
Net Fair Value (27.1)
Other Current Liabilities
  
Derivatives, Fair Value [Line Items]  
Liabilities (22.4)
Other LongTerm Liabilities
  
Derivatives, Fair Value [Line Items]  
Liabilities (4.7)
Level 1
  
Derivatives, Fair Value [Line Items]  
Liabilities (26.0)
Net Fair Value (26.0)
Level 1 | Other Current Liabilities
  
Derivatives, Fair Value [Line Items]  
Liabilities (21.8)
Level 1 | Other LongTerm Liabilities
  
Derivatives, Fair Value [Line Items]  
Liabilities (4.2)
Level 2
  
Derivatives, Fair Value [Line Items]  
Liabilities (1.1)
Net Fair Value (1.1)
Level 2 | Other Current Liabilities
  
Derivatives, Fair Value [Line Items]  
Liabilities (0.6)
Level 2 | Other LongTerm Liabilities
  
Derivatives, Fair Value [Line Items]  
Liabilities $ (0.5)