Financial Assets and Liabilities at Fair Value, Measured on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Millions, unless otherwise specified	Jul. 28, 2012	Jan. 28, 2012		Jul. 30, 2011
Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 71.8	$ 69.2		$ 137.5
Interest Rate Contract
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities		2.0	[1]	3.3	[1]
Quoted Price In Active Market (Level 1) | Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	71.8	69.2		137.5
Significant Observable Other Inputs (Level 2) | Interest Rate Contract
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities		$ 2.0	[1]	$ 3.3	[1]

[1] The fair value of the interest rate contract is determined using a mark-to-market valuation technique based on an observable interest rate yield curve and adjusting for credit risk.