Share Based Compensation (Stock Option activity) (Details) (USD $)	6 Months Ended
Jul. 28, 2012 y
Stock option activity
Number of Shares Outstanding Beginning Balance	714,997
Number of Shares Outstanding, Weighted average Exercise Price	$ 60.72
Exercised, Number of Shares	(4,000)
Exercised, Weighted average Exercise Price	$ 26.77
Forfeited or cancelled, Number of Shares	(26,400)
Forfeited or cancelled, Weighted-Average Exercise Price	$ 77.91
Number of Shares Outstanding Ending Balance	684,597
Number of Shares Outstanding, Weighted average Exercise Price	$ 60.25
Number of Shares Outstanding, Aggregate Intrinsic Value	$ 2,032,747
Number of Shares Outstanding, Weighted- Average Remaining Contractual Life	4.1
Stock options exercisable	668,597
Stock options exercisable, Weighted-Average Exercise Price	$ 61.20
Stock options exercisable, Aggregate Intrinsic Value	1,774,217
Stock options exercisable, Weighted-Average Remaining Contractual Life	4.1
Stock options expected to become exercisable in the future	15,665
Stock options expected to become exercisable in the future, Aggregate Intrinsic Value	$ 253,206
Stock options expected to become exercisable in the future, Weighted Average Exercise Price	$ 20.59
Stock options expected to become exercisable in the future, Weighted Average Remaining Contractual Life	6.4

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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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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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices 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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The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options that are exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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

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