Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	May 04, 2013	Feb. 02, 2013
Income Taxes [Line Items]
Income tax liability associated with unrecognized tax benefits, gross	$ 1.5	$ 1.9
Income tax liability associated with unrecognized tax benefits, net of federal benefits	0.8	0.8
Income tax liability associated with unrecognized tax benefits, interest	0.1	0.1
Income tax liability associated with unrecognized tax benefits, interest net of federal benefit	0.1	0.1
Income tax liability associated with unrecognized tax benefits, penalties	0.1	0.2
Accrued interest and penalties related to uncertain tax positions	0.2	0.3
Unrecognized Tax Benefits, which may be Recognized in 12 Months
Income Taxes [Line Items]
Income tax liability associated with unrecognized tax benefits, gross	0.9
Income tax liability associated with unrecognized tax benefits, net of federal benefits	0.5
Income tax liability associated with unrecognized tax benefits, penalties	$ 0.1