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Concentration of Risk - Schedule of Significant Customers Accounting for at Least 10% of Net Sales During Period (Details) | 3 Months Ended | 12 Months Ended
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Apr. 29, 2018 | Apr. 30, 2017 | Jan. 28, 2018
Net sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  | 100.00% | 100.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Trend-tek Technology Ltd And Affiliates [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  | 12.00% |  | 8.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Frontek Technology Corporation [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  | 10.00% |  | 9.00%
Customer Concentration Risk [Member] | Net sales [Member] | Arrow Electronics And Affiliates [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  | 12.00% | 9.00% |
Customer Concentration Risk [Member] | Net sales [Member] | Trend-tek Technology Ltd And Affiliates [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  | 12.00% | 10.00% |
Customer Concentration Risk [Member] | Net sales [Member] | Samsung Electronics And Affiliates [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  | 8.00% | 7.00% |
Customer Concentration Risk [Member] | Net sales [Member] | Premier Technical Sales Korea, Inc. And Affiliates [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | [1] | 5.00% | 7.00% |
[1] | Premier is a distributor with a concentration of sales to Samsung. The above percentages represent the Company's estimate of the sales activity related to Samsung that is passing through this distributor.

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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