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Share-Based Compensation (Stock Option Activity) (Details) (USD $)
9 Months Ended
Oct. 27, 2012
Y
Stock Option Activity  
Outstanding, Number of Underlying Shares, Beginning Balance 714,997
Outstanding, Weighted average Exercise Price, Beginning Balance $ 60.72
Exercised, Number of Underlying Shares (8,000)
Exercised, Weighted average Exercise Price $ 27.53
Forfeited or cancelled, Number of Underlying Shares (41,675)
Forfeited or cancelled, Weighted-Average Exercise Price $ 75.13
Outstanding, Number of Underlying Shares, Ending Balance 665,322
Outstanding, Weighted average Exercise Price, Ending Balance $ 60.21
Outstanding, Aggregate Intrinsic Value $ 970,104
Outstanding, Weighted-Average Remaining Contractual Life (in years) 3.9
Stock options exercisable, Number of Underlying Shares 649,322
Stock options exercisable, Weighted-Average Exercise Price $ 61.19
Stock options exercisable, Aggregate Intrinsic Value 810,294
Stock options exercisable, Weighted-Average Remaining Contractual Life (in years) 3.9
Stock options expected to become exercisable in the future, Number of Underlying Shares 15,880
Stock options expected to become exercisable in the future, Weighted Average Exercise Price $ 20.59
Stock options expected to become exercisable in the future, Aggregate Intrinsic Value $ 158,667
Stock options expected to become exercisable in the future, Weighted Average Remaining Contractual Life (in years) 6.1