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Segment Information - International net sales (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 29, 2018 | Jan. 28, 2018 | Oct. 29, 2017 | Jul. 30, 2017 | Apr. 30, 2017 | Jan. 29, 2017 | Oct. 30, 2016 | Jul. 31, 2016 | Apr. 29, 2018 | Apr. 30, 2017 | May 01, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
net sales |  | $ 78,184 | $ 85,310 | $ 80,698 | $ 79,533 | $ 77,350 | $ 76,169 | $ 75,343 | $ 80,682 | $ 323,725 | $ 309,544 | $ 312,860
North america (excluding USA) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
net sales | [1] |  |  |  |  |  |  |  |  | 27,844 | 29,995 | 31,667
Far east and asia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
net sales | [2] |  |  |  |  |  |  |  |  | 40,671 | 34,695 | 31,927
All other areas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
net sales |  |  |  |  |  |  |  |  |  | 5,681 | 3,618 | 4,336
International [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
net sales |  |  |  |  |  |  |  |  |  | $ 74,196 | $ 68,308 | $ 67,930
[1] | Of this amount, $21.9 million, $22.3 million, and $24.2 million are attributable to shipments to Mexico in fiscal 2018, 2017, and 2016, respectively.
[2] | Of this amount $32.6 million, $26.6 million, and $23.1 million are attributable to shipments to China in fiscal 2018, 2017, and 2016, respectively.

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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