Nature of Operations and Basis of Presentation (Narrative) (Details) $ in Thousands	9 Months Ended
Oct. 29, 2017 USD ($) store item	Jan. 29, 2017 USD ($)
Number of retail stores \| store	23
Number of outlet stores \| store	3
Number of classes of authorized common stock \| item	2
Common stock voting and conversion rights	Each share of Class A common stock is entitled to ten votes per share and is convertible at any time into one share of Class B common stock. Each share of Class B common stock is entitled to one vote per share.
Non-current liability related to build-to-suit lease transactions	$ 18,484	$ 3,349
Property and equipment	85,462	56,325
Accumulated depreciation	20,581	15,529
Build-to-Suit Lease [Member] \| Capitalized [member]
Property and equipment	27,500	6,600
Accumulated depreciation	$ 200	$ 10
Class A common stock [Member]
Number of votes per share \| item	10
Class B common stock [Member]
Number of votes per share \| item	1

Number Of Classes Of Authorized Common Stock

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Number Of Outlet Stores

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Number Of Votes Per Share

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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Represents the number of stores.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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