Common Stock Options (Schedule of Stock Option Activity Under Plan) (Details) (USD $)	3 Months Ended	12 Months Ended
	May 04, 2013	Feb. 02, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, Beginning balance (shares)	1,187,817
Options outstanding, Granted (shares)	122,250
Options outstanding, Forfeited (shares)	(4,843)
Options outstanding, Exercised (shares)	(36,781)
Options outstanding, Ending balance (shares)	1,268,443	1,187,817
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, Beginning balance (dollars per share)	$ 10.43
Weighted average exercise price, Granted (dollars per share)	$ 37.22
Weighted average exercise price, Forfeited (dollars per share)	$ 4.95
Weighted average exercise price, Exercised (dollars per share)	$ 4.28
Weighted average exercise price, Ending balance (dollars per share)	$ 13.21	$ 10.43
Options outstanding, Exercisable (shares)	56,158
Options Exercisable, Weighted average exercise price, (dollars per share)	$ 10.73
Options Outstanding, Weighted average remaining contractual term (years)	8 years 10 months 24 days	9 years 3 months 18 days
Options Exercisable, Weighted average remaining contractual term (years)	7 years 2 months 12 days