Stock Based Compensation Additional - (Details) (USD $)	12 Months Ended
Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining Weighted-Average Vesting Period	8 years 3 months 18 days	9 years 0 months 15 days
Intrinsic Value Of Vested and Excercisable Options	$ 38,926,000
Remaining Contractual Term For Vested and Excercisable Options	0 years 8 months 12 days
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward
Exercised	500	9,050	5,750
Restricted Stock \| Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized Compensation Expense	10,357,000
Remaining Weighted-Average Vesting Period	2 years 7 months 6 days
Compensation Expense	3,474,000	2,924,000	2,669,000
Stock Options \| Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding - Weighted Average Price		14.17
Intrinsic Value	11,000	112,000	79,000
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Options Outstanding	500
Exercised	(500)
Options Outstanding		500
Stock Options \| Convertible Class B Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding - Weighted Average Price	$ 23.5595697322005	23.56
Outstanding Vested and Excercisable Options	4,025
Weighted Average Price For Stock Options Vested and Excercisable	$ 23.5595697322005
Intrinsic Value for Options Outstanding	194,628	163,000
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward
Options Outstanding	20,127
Granted	0
Forfeited of expired	0
Options Outstanding	20,127
Employee Stock Purchase Plan \| Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Sold	20,941	19,070	33,000
Compensation Expense	$ 90,000	70,000	128,000
Employee Stock Purchase Plan Share Purchase Discount	$ 4.30

No authoritative reference available.

No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, 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 or that expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-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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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share instruments newly issued under a share-based compensation plan.

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

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