Effect of Derivative Instruments on Condensed Consolidated Income Statements (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in OCI on derivatives (Effective portion)	$ (1.2)	$ 15.4	$ (14.1)	$ 32.4
Amount of gain/(loss) reclassified from accumulated OCI into income (Effective portion)	5.9	3.4	14.5	6.3
Amount of gain/(loss) recognized in income on derivatives	1.1	0.3	1.1	0.7
Cash Flow Hedging | Foreign Exchange Contract | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in OCI on derivatives (Effective portion)	0.9	1.1	0.1	(0.7)
Amount of gain/(loss) reclassified from accumulated OCI into income (Effective portion)	0.1		0.2	(0.1)
Cash Flow Hedging | Commodity Contract | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in OCI on derivatives (Effective portion)	(2.1)	14.3	(14.2)	33.1
Amount of gain/(loss) reclassified from accumulated OCI into income (Effective portion)	5.8	3.4	14.3	6.4
Not Designated as Hedging Instrument | Foreign Exchange Contract | Other operating income, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in income on derivatives	$ 1.1	$ 0.3	$ 1.1	$ 0.7