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Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Thousands | Jan. 28, 2018 | Jan. 29, 2017
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Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | $ 12,758 | $ 12,059
Deferred Revenues [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | 9,794 | 11,419
Deferred Cost of Revenues [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | (2,189) | (2,246)
Deferred Revenue, Net [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | 7,605 | 9,173
Deferred Product Design and Engineering Recoveries [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | $ 5,153 | $ 2,886

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