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Acquisitions (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 03, 2017 | Jul. 27, 2017 | Apr. 28, 2018 | Jan. 27, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Jan. 27, 2018 | Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | $ 908.3 | $ 816.5 | $ 809.1
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  |  |  |  |  | 130.9 | 0.0 | 0.0
Net Income |  |  | $ 36.8 | $ (24.3) | $ 24.2 | $ 20.5 | $ 23.1 | $ 23.7 | $ 24.9 | $ 21.2 |  | 57.2 | $ 92.9 | $ 84.6
Procoplast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  |  |  |  |  |  |  |  | 1.3 |  |
Business Acquisition, Pro Forma Adjustment to Other Income |  |  |  | (0.2) |  |  |  |  |  |  | $ (0.5) |  |  |
Percentage voting interests acquired |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 22.2 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  | (1.3) |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Adjustment to Income Tax Expense |  |  |  | $ (0.1) |  |  |  |  |  |  | $ (0.2) |  |  |
Procoplast [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  |  |  |  |  |  |  |  | 1.1 |  |
Procoplast [Member] | Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  |  |  |  |  |  |  |  | 0.2 |  |
Pacific Insight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 54.4 |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  |  |  |  |  |  |  |  | 5.5 |  |
Percentage voting interests acquired | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 108.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  | $ 1.9 |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  |  | 1.5 |  |
Pacific Insight [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  |  |  |  |  |  |  |  | 4.9 |  |
Pacific Insight [Member] | Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  |  |  |  |  |  |  |  | $ 0.6 |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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