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Significant Accounting Policies - Narrative - Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Apr. 28, 2018 | Jan. 27, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 249.0 | $ 228.0 | $ 230.1 | $ 201.2 | $ 219.7 | $ 195.6 | $ 209.3 | $ 191.9 | $ 908.3 | $ 816.5 | $ 809.1
Preproduction Tooling [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | $ 10.4 |  |

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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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