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Summary of Quarterly Results of Operations (Unaudited) - Summary of Unaudited Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs | $ 0.0 | $ 0.0 | $ 4.2 | $ 2.6 | $ 1.5 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |
Revenue from Grants | (2.2) | (3.6) | (1.5) | 0.0 | (1.5) | (1.5) | (1.5) | 0.0 |  |  |
Income Tax Expense |  |  |  |  |  |  |  |  | $ 66.6 | $ 23.0 | $ 26.3
Foreign Investment Tax Credit | (8.7) | (0.3) | (0.4) | (0.4) |  |  |  |  | (9.8) | (4.7) | (2.1)
Net Sales | 249.0 | 228.0 | 230.1 | 201.2 | 219.7 | 195.6 | 209.3 | 191.9 | 908.3 | 816.5 | 809.1
Gross Profit | 61.9 | 60.1 | 62.0 | 55.6 | 55.2 | 53.4 | 55.6 | 54.1 | 239.6 | 218.3 | 212.9
Net Income | $ 36.8 | $ (24.3) | $ 24.2 | $ 20.5 | $ 23.1 | $ 23.7 | $ 24.9 | $ 21.2 | 57.2 | $ 92.9 | $ 84.6
Net income per diluted common share (in dollars per share) | $ 0.98 | $ (0.65) | $ 0.64 | $ 0.55 | $ 0.62 | $ 0.63 | $ 0.66 | $ 0.57 |  |  |
Net income per basic common share (in dollars per share) | $ 0.99 | $ (0.65) | $ 0.65 | $ 0.55 | $ 0.62 | $ 0.64 | $ 0.66 | $ 0.57 |  |  |
Hetronic Lawsuit |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Legal Fees | $ 2.1 | $ 1.5 | $ 1.6 | $ 2.9 | $ 2.8 | $ 1.6 | $ 2.3 | $ 4.3 |  |  |
RSAs | Executives and non-executive members of management | 2014 Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated share-based compensation expense, amount recorded to true-up prior periods | 0.0 | (6.0) | 0.0 | 0.0 |  |  |  |  |  |  |
Total Impact of U.S. Tax Reform [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense | $ (3.1) | $ 56.8 | $ 0.0 | $ 0.0 |  |  |  |  | $ 53.7 |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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