Business Segments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Segment Reporting Information [Line Items]
Decrease in segment profit due to non-cash inventory step-up amortization	$ 386.3us-gaap_OperatingIncomeLoss	$ 352.3us-gaap_OperatingIncomeLoss

The net result for the period of deducting operating expenses from operating revenues.

No definition available.

Name:	us-gaap_OperatingIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration