Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 29, 2011	Oct. 29, 2011	Nov. 18, 2012	Jan. 29, 2011	Nov. 18, 2011
Line of Credit Facility [Line Items]
Number of unsecured credit facilities	2	2		2
Expiration date of renewed facility			November 18, 2012
Maximum borrowing capacity under renewed facility					$ 50.0
Interest rate under renewed facility			prime plus 2%
Available borrowings under credit facilities	80.0	80.0		80.0
Days borrowings incurred against facilities	0	0		10
Average borrowings outstanding	0	0		5.3
Maximum borrowings outstanding	0	0		10.8
Average interest rate on outstanding borrowings	0.00%	0.00%		2.28%
Debt outstanding at period end	0	0		0
Subsequent Event [Line Items]
Maximum borrowing capacity under renewed facility					50.0
Interest rate under renewed facility			prime plus 2%
Expiration date of renewed facility			November 18, 2012
August 2011 Facility [Member]
Line of Credit Facility [Line Items]
Expiration date of renewed facility		August 2012		August 2011
Maximum borrowing capacity under renewed facility	30.0	30.0		30.0
Interest rate under renewed facility		higher of prime rate, the federal funds rate plus 0.5% or LIBOR		higher of prime rate, the federal funds rate plus 0.5% or LIBOR
Subsequent Event [Line Items]
Maximum borrowing capacity under renewed facility	30.0	30.0		30.0
Interest rate under renewed facility		higher of prime rate, the federal funds rate plus 0.5% or LIBOR		higher of prime rate, the federal funds rate plus 0.5% or LIBOR
Expiration date of renewed facility		August 2012		August 2011
November 2011 Facility [Member]
Line of Credit Facility [Line Items]
Expiration date of renewed facility		November 2011		November 2011
Maximum borrowing capacity under renewed facility	50.0	50.0		50.0
Interest rate under renewed facility		prime plus 2%		prime plus 2%
Subsequent Event [Line Items]
Maximum borrowing capacity under renewed facility	$ 50.0	$ 50.0		$ 50.0
Interest rate under renewed facility		prime plus 2%		prime plus 2%
Expiration date of renewed facility		November 2011		November 2011