Accounts Receivable by Portfolio Segment, Net (Detail) (USD $) In Millions, unless otherwise specified	Jul. 28, 2012	Jan. 28, 2012	Jul. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, net	$ 1,032.2	$ 1,088.2	$ 906.8
US Customer In-House Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, net	1,024.2	1,077.4	901.2
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, net	$ 8.0	$ 10.8	$ 5.6