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Summary of Quarterly Results of Operations (Unaudited) - Significant Items for Fiscal 2017 (Details) - USD ($) $ in Millions | 3 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
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Costs Associated with Shutting Down a Business |  |  |  |  | $ 2.2 | $ 0.0 | $ 0.0 | $ 0.0
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
Hetronic Lawsuit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Legal Fees | $ 2.1 | $ 1.5 | $ 1.6 | $ 2.9 | $ 2.8 | $ 1.6 | $ 2.3 | $ 4.3

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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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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + 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 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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