Allowance For Credit Losses On US Customer In-House Finance Receivables (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Jan. 28, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance	$ (80.2)	$ (72.2)	$ (78.1)
Ending receivable balance evaluated for impairment	1,067.8	954.4	1,155.5
Accounts receivable, net	998.2	891.2	1,088.2
US Customer In-House Finance Receivables
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	(78.1)	(67.8)	(67.8)
Charge-offs	79.3	66.3	92.8
Recoveries	16.6	14.8	19.3
Provision	(98.0)	(85.5)	(122.4)
Ending balance	(80.2)	(72.2)	(78.1)
Ending receivable balance evaluated for impairment	1,067.8	954.4	1,155.5
Accounts receivable, net	$ 987.6	$ 882.2	$ 1,077.4