Net Fair Value of Commodity Price Risk (Detail) (USD $) In Millions, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Liabilities	$ (3.2)	$ (5.8)
Net Fair Value	(3.2)	(5.7)
Assets		0.1
Other Current Assets
Derivatives, Fair Value [Line Items]
Assets		0.1
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(3.0)	(5.5)
Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(0.2)	(0.3)
Level 1
Derivatives, Fair Value [Line Items]
Liabilities	(2.6)	(2.6)
Net Fair Value	(2.6)	(2.5)
Assets		0.1
Level 1 | Other Current Assets
Derivatives, Fair Value [Line Items]
Assets		0.1
Level 1 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(2.5)	(2.6)
Level 1 | Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(0.1)
Level 2
Derivatives, Fair Value [Line Items]
Liabilities	(0.6)	(3.2)
Net Fair Value	(0.6)	(3.2)
Assets
Level 2 | Other Current Assets
Derivatives, Fair Value [Line Items]
Assets
Level 2 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(0.5)	(2.9)
Level 2 | Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(0.1)	(0.3)
Level 3
Derivatives, Fair Value [Line Items]
Liabilities
Net Fair Value
Assets
Level 3 | Other Current Assets
Derivatives, Fair Value [Line Items]
Assets
Level 3 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities
Level 3 | Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities