Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended	12 Months Ended
	Jul. 02, 2016 USD ($) sites	Dec. 28, 2013 USD ($)	Jan. 02, 2016 USD ($)
Loss Contingencies [Line Items]
Superfund Sites | sites	31
Environmental remediation. Period construction of treatment facility to be maintained	30 years
Centredale Site [Member]
Loss Contingencies [Line Items]
Environmental remediation costs, reserve	$ 68.1
Centredale Site [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable		$ 68.1
Centredale Site [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable		$ 139.7
Property, Plant and Equipment, Other Types
Loss Contingencies [Line Items]
Environmental remediation costs, reserve	165.9		$ 170.7
Reserve for environmental remediation costs, current	17.8
Reserve for environmental remediation costs, noncurrent	148.1
Accrual for Environmental Loss Contingencies, EPA Funded Amount	15.9
Accrual for Environmental Loss Contingencies, Obligation After EPA Funding	150.0
Property, Plant and Equipment, Other Types | Minimum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	132.2
Property, Plant and Equipment, Other Types | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	$ 273.0