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Stock Based Compensation Additional - (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 2014	Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation Expense			$ 1,940,000	$ 1,689,000
Restricted Stock | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized Compensation Expense	$ 14,528,000	$ 12,330,000	$ 14,528,000	$ 12,330,000	$ 10,357,000
Remaining Weighted-Average Vesting Period			3 years 1 month 6 days	3 years 1 month	2 years 7 months 6 days
Compensation Expense	$ 1,319,000	$ 1,183,000
Employee Stock Purchase Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Sold			8,781	12,748
Compensation Expense			$ 47,000	$ 52,000
Employee Stock Purchase Plan Share Purchase Discount	$ 5.40	$ 4.11	$ 5.40	$ 4.11

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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