Hedging Transactions and Derivative Financial Instruments - Summary of Reconciliation of Company's Derivatives by Contract Type (Detail) (USD $) In Millions, unless otherwise specified	Apr. 04, 2015	Jan. 03, 2015
Derivative [Line Items]
Assets	$ 2.2	$ 1.2
Liabilities	(3.1)	(2.3)
Foreign Exchange Contract [Member]
Derivative [Line Items]
Assets	2.0	1.0
Aluminum Swaps [Member]
Derivative [Line Items]
Assets	0.2	0.2
Liabilities	$ (3.1)	$ (2.3)

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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