Net Fair Value of Commodity Price Risk (Detail) (USD $) In Millions, unless otherwise specified	Jul. 13, 2013
Derivatives, Fair Value [Line Items]
Liabilities	$ (13.2)
Net Fair Value	(13.2)
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(12.0)
Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(1.2)
Level 1
Derivatives, Fair Value [Line Items]
Liabilities	(12.0)
Net Fair Value	(12.0)
Level 1 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(11.2)
Level 1 | Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(0.8)
Level 2
Derivatives, Fair Value [Line Items]
Liabilities	(1.2)
Net Fair Value	(1.2)
Level 2 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(0.8)
Level 2 | Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	$ (0.4)