Components Of Exit Costs (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended			12 Months Ended
	Jul. 28, 2012	Jul. 28, 2012 Lease Termination Costs		Jan. 28, 2012 Lease Termination Costs		Jan. 29, 2011 Lease Termination Costs Scenario, Previously Reported	Jan. 28, 2012 Lease Termination Costs Restatement Adjustment
Restructuring Cost and Reserve [Line Items]
Accrual Balance, end of period	$ 3.9	$ 3.9	[1]	$ 5.8	[1]	$ 1.6	$ 5.8
Accrual Balance, beginning of period	7.5	5.8	[1]			1.6	5.8
Balance Adjusted	$ 2.7	$ 2.0	[1]	$ 4.2

[1] The accrual balance as of January 28, 2012 was changed from $1.6 (disclosed in the prior period) to $5.8, as the previously-disclosed prior period amount did not include a $4.2 accrual as of January 29, 2011 related to lease costs incurred and recorded prior to the commencement of the exit activities.