Principal Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 02, 2013 D Segment M Y	Jan. 28, 2012	Jan. 29, 2011
Principal Accounting Policies [Line Items]
Deferred revenue recognition period of extended service plan sales, years	14
Revenue recognized percentage in relation to the costs expected to be incurred within the first two years	46.00%
Revenue recognized in relation to the costs expected to be incurred, number of years	2
Lifetime diamond guarantee inspection period (in months)	6
Gross advertising costs	$ 245.8	$ 208.6	$ 178.1
Number of reporting units goodwill allocated	2
Goodwill	$ 24.6	$ 0
Minimum accrued interest suspension period, days	90
Allowance on losses	100.00%
Maturity of allowance, days	90
Period which receivables are charged to cost of sales, recency method, days	120
Period which receivables are charged to cost of sales, contractual method, days	240
Minimum
Principal Accounting Policies [Line Items]
Period over which amortization is charged for capitalized payroll for internal use computer project, years	3
Maximum
Principal Accounting Policies [Line Items]
Period over which amortization is charged for capitalized payroll for internal use computer project, years	5
Buildings, Owned Land | Minimum
Principal Accounting Policies [Line Items]
Property and equipment, estimated useful lives, (in years)	30 years
Buildings, Owned Land | Maximum
Principal Accounting Policies [Line Items]
Property and equipment, estimated useful lives, (in years)	40 years
Buildings, Leased Land | Minimum
Principal Accounting Policies [Line Items]
Property and equipment, estimated useful lives, (in years)	30 years
Buildings, Leased Land | Maximum
Principal Accounting Policies [Line Items]
Property and equipment, estimated useful lives, (in years)	40 years
Leasehold Improvements | Maximum
Principal Accounting Policies [Line Items]
Property and equipment, estimated useful lives, (in years)	10 years
Furniture and Fixtures | Minimum
Principal Accounting Policies [Line Items]
Property and equipment, estimated useful lives, (in years)	3 years
Furniture and Fixtures | Maximum
Principal Accounting Policies [Line Items]
Property and equipment, estimated useful lives, (in years)	10 years
Equipment Including Software | Minimum
Principal Accounting Policies [Line Items]
Property and equipment, estimated useful lives, (in years)	3 years
Equipment Including Software | Maximum
Principal Accounting Policies [Line Items]
Property and equipment, estimated useful lives, (in years)	5 years