Components of Net Deferred Tax Assets (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Feb. 02, 2013	Jan. 28, 2012	Jan. 31, 2009
Deferred Tax Assets [Line Items]
Deferred tax assets	$ 58.5	$ 56.8
Deferred tax liabilities	9.6	3.4
Deferred tax assets, valuation allowance	$ 3.6	$ 3.0	$ 28.6