Net Fair Value of Commodity Price Risk (Detail) (USD $) In Millions, unless otherwise specified	Jul. 12, 2014
Derivatives, Fair Value [Line Items]
Liabilities	$ (14.6)
Net Fair Value	(14.6)
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(12.8)
Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(1.8)
Level 1
Derivatives, Fair Value [Line Items]
Liabilities	(14.1)
Net Fair Value	(14.1)
Level 1 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(12.6)
Level 1 | Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(1.5)
Level 2
Derivatives, Fair Value [Line Items]
Liabilities	(0.5)
Net Fair Value	(0.5)
Level 2 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(0.2)
Level 2 | Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	$ (0.3)