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Significant Accounting Policies - Narrative - Financial Reporting Periods (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Financial Reporting Periods [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fiscal year duration |  |  |  |  |  |  |  |  | fifty-two weeks | fifty-two weeks | fifty-two weeks
Research and Development Expense |  |  |  |  |  |  |  |  | $ 37.9 | $ 27.8 | $ 27.8
Net Sales | $ 249.0 | $ 228.0 | $ 230.1 | $ 201.2 | $ 219.7 | $ 195.6 | $ 209.3 | $ 191.9 | $ 908.3 | $ 816.5 | $ 809.1
Minimum |  |  |  |  |  |  |  |  |  |  |
Financial Reporting Periods [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fiscal year duration |  |  |  |  |  |  |  |  | fifty-two weeks |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Financial Reporting Periods [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fiscal year duration |  |  |  |  |  |  |  |  | fifty-three weeks |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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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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