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Business Combinations - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 11, 2014 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 30, 2016 | Jan. 30, 2016 | Oct. 31, 2015 | Aug. 01, 2015 | Apr. 29, 2017 | Apr. 30, 2016 | May 02, 2015 | Mar. 15, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 143,682 | $ 115,719 | $ 169,992 | $ 157,146 | $ 138,463 | $ 123,816 | $ 157,668 | $ 150,221 | $ 586,539 | $ 570,168 | $ 615,942 |
Goodwill |  | 7,812 |  |  |  | 8,116 |  |  |  | 7,812 | 8,116 |  |
International |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 89,260 | 94,472 | 102,282 |
Goodwill |  | 2,294 |  |  |  | 2,387 |  |  |  | 2,294 | 2,387 |  |
Commerical |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 148,073 | 148,261 | $ 165,793 |
Goodwill |  | 3,199 |  |  |  | $ 3,350 |  |  |  | 3,199 | $ 3,350 |  |
Data Display [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment acquired |  |  |  |  |  |  |  |  | 1,433 |  |  |  |
Investment for affiliates |  |  |  |  |  |  |  |  | 437 |  |  |  |
Inventory acquired |  |  |  |  |  |  |  |  | 2,624 |  |  |  |
Receivables acquired |  |  |  |  |  |  |  |  | 3,063 |  |  |  |
Other current assets acquired |  |  |  |  |  |  |  |  | 1,892 |  |  |  |
Liabilities acquired |  |  |  |  |  |  |  |  | 3,695 |  |  |  |
Long term debt obligations |  |  |  |  |  |  |  |  | 950 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 1,463 |  |  |  |
Data Display [Member] | Unpatented Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets useful life | 20 years |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets other than goodwill |  |  |  |  |  |  |  |  | 480 |  |  |  |
Data Display [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets useful life | 18 years |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets other than goodwill |  |  |  |  |  |  |  |  | $ 84 |  |  |  |
ADFLOW Networks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Property and equipment acquired |  | 58 |  |  |  |  |  |  |  | 58 |  |  |
Inventory acquired |  | 230 |  |  |  |  |  |  |  | 230 |  |  |
Receivables acquired |  | 1,283 |  |  |  |  |  |  |  | 1,283 |  |  |
Other current assets acquired |  | 616 |  |  |  |  |  |  |  | 616 |  |  |
Liabilities acquired |  | 935 |  |  |  |  |  |  |  | 935 |  |  |
Long term debt obligations |  | 1,387 |  |  |  |  |  |  |  | 1,387 |  |  |
Business Combination, Contingent Consideration, Liability |  | $ 1,833 |  |  |  |  |  |  |  | 1,833 |  |  |
Deferred payments period |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 2,557 |  |  |  |  |  |  |  | 2,557 |  |  |
ADFLOW Networks [Member] | Commerical |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 9,922 |  |  |
ADFLOW Networks [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets other than goodwill |  | 2,692 |  |  |  |  |  |  |  | 2,692 |  |  |
ADFLOW Networks [Member] | Computer Software, Intangible Asset [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets other than goodwill |  | $ 3,176 |  |  |  |  |  |  |  | $ 3,176 |  |  |

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