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Income Taxes - Income (Loss) before Income Taxes Related to Foreign and U.S. Operations (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
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
income (loss) before income taxes, foreign |  |  |  |  |  |  |  |  | $ 17,360 | $ 18,703 | $ 17,715
income before income taxes | $ 6,466 | $ 7,516 | $ 6,159 | $ 6,742 | $ 6,999 | $ 6,990 | $ 7,159 | $ 8,546 | 26,883 | 29,696 | 27,898
China [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
income (loss) before income taxes, foreign |  |  |  |  |  |  |  |  | 11,036 | 13,650 | 14,130
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
income (loss) before income taxes, foreign |  |  |  |  |  |  |  |  | 5,985 | 4,918 | 3,647
Poland [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
income (loss) before income taxes, foreign |  |  |  |  |  |  |  |  |  | (19) | (62)
Cayman Islands [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
income (loss) before income taxes, foreign |  |  |  |  |  |  |  |  | 339 | 154 |
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
income (loss) before income taxes, domestic |  |  |  |  |  |  |  |  | $ 9,523 | $ 10,993 | $ 10,183

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- Definition Income Taxes [Line Items] + References No definition available. + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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