Shareholders' Equity (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011
Restricted share and restricted share unit awards
Shareholders Equity
Number of Shares	546,629
Unrecognized compensation expense related to unvested share-based restricted stock awards and the unvested restricted share units (in dollars)	$ 2.6
Restricted share and restricted share unit awards | Non-employee directors | Maximum
Shareholders Equity
Number of Shares	100,000
Restricted share
Shareholders Equity
Number of Shares	487,500
Restricted share | Fiscal 2009
Shareholders Equity
Number of Shares	437,500
Average Market Price on Date of Grant (in dollars per share)	$ 11
Restricted share | Fiscal 2010
Shareholders Equity
Number of Shares	20,000
Average Market Price on Date of Grant (in dollars per share)	$ 22
Restricted share | Fiscal 2011
Shareholders Equity
Number of Shares	30,000
Average Market Price on Date of Grant (in dollars per share)	$ 23
Restricted share units | Fiscal 2012
Shareholders Equity
Number of Shares	59,129
Average Market Price on Date of Grant (in dollars per share)	$ 47
Stock options
Shareholders Equity
Term of option	10 years
Percentage of options that vested and became exercisable on each anniversary from the date of grant	20.00%
Total intrinsic value for stock options exercised (in dollars)	1.3	0.7	0.2
Shares
Stock options outstanding and exercisable, beginning of fiscal year (in shares)	78,500	151,120	191,105
Stock options exercised (in shares)	(54,900)	(68,620)	(16,005)
Stock options forfeited (in shares)	(2,500)	(4,000)	(23,980)
Stock options outstanding and exercisable, end of fiscal year (in shares)	21,100	78,500	151,120
Weighted Average Exercise Price
Stock options outstanding and exercisable, beginning of fiscal year (in dollars per share)	$ 27	$ 26	$ 25
Stock options exercised (in dollars per share)	$ 26	$ 25	$ 12
Stock options forfeited (in dollars per share)	$ 33	$ 26	$ 27
Stock options outstanding and exercisable, end of fiscal year (in dollars per share)	$ 28	$ 27	$ 26
Aggregate intrinsic value for options outstanding and exercisable (in dollars)	$ 0.4
Stock options | Maximum
Weighted Average Exercise Price
Stock options outstanding and exercisable, end of fiscal year (in dollars per share)	$ 32.75
Stock options | Minimum
Weighted Average Exercise Price
Stock options outstanding and exercisable, end of fiscal year (in dollars per share)	$ 26.44