Share-Based Compensation (Stock Option Activity) (Details) (USD $)	9 Months Ended
Nov. 02, 2013
Stock Option Activity, Number of Underlying Shares
Outstanding, Number of Underlying Shares, Beginning Balance	569,400
Exercised, Number of Underlying Shares	(7,500)
Forfeited or expired, Number of Underlying Shares	(23,800)
Outstanding, Number of Underlying Shares, Ending Balance	538,100
Stock Option Activity, Weighted Average Exercise Price
Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 65.40
Exercised, Weighted-Average Exercise Price	$ 28.24
Forfeited or expired, Weighted-Average Exercise Price	$ 76.01
Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 65.44
Outstanding, Aggregate Intrinsic Value	$ 1,048,700
Outstanding, Weighted-Average Remaining Contractual Life (in years)	3 years 6 months
Stock options exercisable, Number of Underlying Shares	538,100
Stock options exercisable, Weighted-Average Exercise Price	$ 65.44
Stock options exercisable, Aggregate Intrinsic Value	1,048,700
Stock options exercisable, Weighted-Average Remaining Contractual Life (in years)	3 years 6 months
Stock options expected to become exercisable in the future, Number of Underlying Shares	0
Stock options expected to become exercisable in the future, Weighted-Average Exercise Price	$ 0.00
Stock options expected to become exercisable in the future, Aggregate Intrinsic Value	$ 0

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Number of share options (or share units) exercised during the current period.

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