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Business Combinations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May. 02, 2015 | Jan. 31, 2015 | Nov. 01, 2014 | Aug. 02, 2014 | Apr. 26, 2014 | Jan. 25, 2014 | Oct. 26, 2013 | Jul. 27, 2013 | May. 02, 2015 | Apr. 26, 2014 | Apr. 27, 2013 | Aug. 11, 2014 | May. 08, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  |  | $ 1,249 |  |  |  |
Net sales | $ 158,086 | $ 118,123 | $ 173,115 | $ 166,618 | $ 136,240 | $ 115,369 | $ 161,639 | $ 138,722 | 615,942 | $ 551,970 | $ 518,322 |  |
General and administrative |  |  |  |  |  |  |  |  | 30,679 | 27,984 | 27,404 |  |
International |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  |  | 1,249 |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 102,282 | 85,578 | $ 75,766 |  |
OPEN |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Goodwill acquired |  | 1,249 |  |  |  |  |  |  |  |  |  |  |
Property and equipment acquired |  | 2,658 |  |  |  |  |  |  |  |  |  |  |
Inventory acquired |  | 2,038 |  |  |  |  |  |  |  |  |  |  |
Other current assets acquired |  | 833 |  |  |  |  |  |  |  |  |  |  |
Liabilities acquired |  | 1,230 |  |  |  |  |  |  |  |  |  |  |
Long-term debt acquired |  | 4,155 |  |  |  |  |  |  |  |  |  |  |
Deferred payments |  | $ 2,375 |  |  |  |  |  |  |  |  |  |  |
Deferred payments period |  | 5 years |  |  |  |  |  |  |  |  |  |  |
OPEN | International |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,218 |  |  |  |
General and administrative |  |  |  |  |  |  |  |  | 44 | $ 146 |  |  |
OPEN | Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets acquired |  | $ 1,160 |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets useful life |  | 20 years |  |  |  |  |  |  |  |  |  |  |
OPEN | Customer Lists |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets acquired |  | $ 582 |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets useful life |  | 9 years |  |  |  |  |  |  |  |  |  |  |
Data Display [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Goodwill acquired |  |  | 1,249 |  |  |  |  |  |  |  |  |  |
Property and equipment acquired |  |  |  |  |  |  |  |  |  |  |  | $ 1,433 |
Other Noncurrent Assets acquired |  |  |  |  |  |  |  |  |  |  |  | 437 |
Inventory acquired |  |  |  |  |  |  |  |  |  |  |  | 2,773 |
Receivables acquired |  |  |  |  |  |  |  |  |  |  |  | 3,380 |
Other current assets acquired |  |  |  |  |  |  |  |  |  |  |  | 1,869 |
Liabilities acquired |  |  |  |  |  |  |  |  |  |  |  | 3,616 |
Long term debt obligations |  |  |  |  |  |  |  |  |  |  |  | $ 950 |
Data Display [Member] | International |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,138 |  |  |  |
General and administrative |  |  |  |  |  |  |  |  | $ 434 |  |  |  |
Data Display [Member] | Unpatented Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 480 |  |  |  |  |  |  |  |  |  |
Acquired intangible assets useful life |  |  | 20 years |  |  |  |  |  |  |  |  |  |
Data Display [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 84 |  |  |  |  |  |  |  |  |  |
Acquired intangible assets useful life |  |  | 18 years |  |  |  |  |  |  |  |  |  |

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