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Summary of Significant Accounting Policies (Stock-based Compensation) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Mar. 31, 2012
Feb. 01, 2014
Feb. 02, 2013
Jan. 28, 2012
Accounting Policies [Abstract]        
Stock-based compensation expense   $ 9.9 $ 6.9 $ 1.2
Expenses on date of modification $ 5.3 $ 0.2 $ 5.4