Share-Based Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Share-Based Compensation Plans
Share-based compensation expense	$ 4.2	$ 3.5	$ 8.3	$ 6.5
Shares
Outstanding at the beginning of the period (in shares)			1,314,422
Granted (in shares)			100,349
Exercised (in shares)			(143,298)
Forfeited (in shares)			(7,000)
Expired (in shares)			(322)
Outstanding at the end of the period (in shares)	1,264,151		1,264,151
Exercisable at the end of the period (in shares)	703,761		703,761
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)			$ 22.61
Granted (in dollars per share)			$ 40.13
Exercised (in dollars per share)			$ 18.65
Forfeited (in dollars per share)			$ 22.72
Expired (in dollars per share)			$ 17.62
Outstanding at the end of the period (in dollars per share)	$ 24.45		$ 24.45
Exercisable at the end of the period (in dollars per share)	$ 21.76		$ 21.76
Additional disclosures
Weighted-average grant date fair value of stock options granted (in dollars per share)			$ 17.21
Stock Options
Assumptions used to value stock options
Risk-free interest rate (as a percent)			1.09%
Expected lives (in years)			5 years
Dividend yield (as a percent)			2.07%
Expected volatility (as a percent)			58.67%
Unrecognized compensation cost
Unrecognized compensation cost related to nonvested stock options	$ 5.4		$ 5.4
Compensation recognition period			2 years 2 months 12 days