Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		12 Months Ended		6 Months Ended				6 Months Ended
	Jun. 29, 2013 sites	Dec. 29, 2012 Minimum	Jun. 29, 2013 Centredale Site	Jun. 29, 2013 Centredale Site Minimum	Jun. 29, 2013 Centredale Site Maximum	Jun. 29, 2013 Property, Plant and Equipment, Other Types	Dec. 29, 2012 Property, Plant and Equipment, Other Types	Jun. 29, 2013 Property, Plant and Equipment, Other Types Minimum	Jun. 29, 2013 Property, Plant and Equipment, Other Types Maximum
Loss Contingencies [Line Items]
Environmental Loss Contingency, Remediation Period Requested		30 years
Environmental remediation costs deemed probable and reasonably estimable				$ 68.1	$ 139.7			$ 138.1	$ 277.0
Environmental remediation costs, reserve			68.1			184.5	188.0
Superfund Sites	31
Reserve for environmental remediation costs, current						7.5
Reserve for environmental remediation costs, noncurrent						177.0
Accrual for Environmental Loss Contingencies, EPA Funded Amount						24.3
Accrual for Environmental Loss Contingencies, Obligation After EPA Funding						$ 160.2