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Acquisitions - Narrative (Details) - USD ($) $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 27, 2019 | Sep. 12, 2018 | Oct. 03, 2017 | Jul. 27, 2017 | Apr. 27, 2019 | Apr. 28, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  |  |  |  | $ 422.1 | $ 130.9
Grakon |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage acquired |  | 100.00% |  |  |  |
Payments to acquire businesses, net of cash acquired |  | $ 422.1 |  |  |  |
Goodwill, increase (decrease) | $ (0.2) |  |  |  |  |
Acquisition-related costs incurred |  |  |  |  | 15.4 |
Grakon | Selling and Administrative Expenses |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related costs incurred |  |  |  |  | 9.8 |
Grakon | Cost of Products Sold |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related costs incurred |  |  |  |  | $ 5.6 |
Procoplast |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage acquired |  |  |  | 100.00% |  |
Payments to acquire businesses, net of cash acquired |  |  |  | $ 22.2 |  |
Amortization period |  |  |  | 14 years 4 months 24 days |  |
Pacific Insight |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage acquired |  |  | 100.00% |  |  |
Payments to acquire businesses, net of cash acquired |  |  | $ 108.7 |  |  |
Amortization period |  |  | 10 years 8 months 12 days |  |  |
Procoplast and Pacific Insight |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related costs incurred |  |  |  |  |  | 6.8
Procoplast and Pacific Insight | Selling and Administrative Expenses |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related costs incurred |  |  |  |  |  | 6.0
Procoplast and Pacific Insight | Cost of Products Sold |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related costs incurred |  |  |  |  |  | $ 0.8

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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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