Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jul. 28, 2012	Jan. 28, 2012
Income Taxes [Line Items]
Unrecognized tax benefits, gross	$ 1.5	$ 1.6
Unrecognized tax benefits, net of federal benefits	0.7	0.7
Unrecognized tax benefits, interest	0.2	0.3
Unrecognized tax benefits, interest net of federal benefit	0.1	0.2
Unrecognized tax benefits, penalties	0.1	0.1
Accrued interest and penalties related to uncertain tax positions	0.3	0.4
Unrecognized Tax Benefits, Which May be Recognized in 12 Months
Income Taxes [Line Items]
Unrecognized tax benefits, gross	1.0
Unrecognized tax benefits, net of federal benefits	0.7
Unrecognized tax benefits, interest	0.2
Unrecognized tax benefits, interest net of federal benefit	0.1
Unrecognized tax benefits, penalties	$ 0.1

This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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