Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 04, 2015 sites	Dec. 28, 2013	Jan. 03, 2015
Loss Contingencies [Line Items]
Superfund 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	174.8		177.3
Reserve for environmental remediation costs, current	13.7
Reserve for environmental remediation costs, noncurrent	161.1
Accrual for Environmental Loss Contingencies, EPA Funded Amount	21.7
Accrual for Environmental Loss Contingencies, Obligation After EPA Funding	153.1
Property, Plant and Equipment, Other Types | Minimum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	133.0
Property, Plant and Equipment, Other Types | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	266.2
Passaic River [Member] [Domain]
Loss Contingencies [Line Items]
Environmental remediation costs deemed probable and reasonably estimable	1,700.0
Environmental remediation. Period construction of treatment facility to be maintained	5 years