Components Of Exit Costs (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Jul. 28, 2012		Jan. 28, 2012
Restructuring Cost and Reserve [Line Items]
Accrual Balance, beginning of period	$ 7.5
Costs Incurred	2.7
Cash Payments	(6.3)
Accrual Balance, end of period	3.9
Total Charges to Date	15.7
Lease Termination Costs
Restructuring Cost and Reserve [Line Items]
Accrual Balance, beginning of period	5.8	[1]
Costs Incurred	2.0	[1]	4.2
Cash Payments	(3.9)	[1]
Accrual Balance, end of period	3.9	[1]	5.8	[1]
Total Charges to Date	12.6	[1]
Employee Severance and Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Accrual Balance, beginning of period	1.7
Costs Incurred	0.7
Cash Payments	(2.4)
Total Charges to Date	$ 3.1

[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.