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Restructuring - Schedule of Restructuring Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2020
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | $ 4.2 | $ 7.6
Automotive |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 3.9 | 5.9
Industrial |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 0.3 | 0.9
Interface |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs |  | 0.7
Corporate |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs |  | 0.1
Employee Termination Benefits |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 3.8 | 6.3
Employee Termination Benefits | Automotive |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 3.6 | 5.0
Employee Termination Benefits | Industrial |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 0.2 | 0.8
Employee Termination Benefits | Interface |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs |  | 0.4
Employee Termination Benefits | Corporate |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs |  | 0.1
Asset Impairment Charges |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 0.4 | 0.7
Asset Impairment Charges | Automotive |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 0.3 | 0.3
Asset Impairment Charges | Industrial |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | $ 0.1 | 0.1
Asset Impairment Charges | Interface |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs |  | 0.3
Contract Termination Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs |  | 0.6
Contract Termination Costs | Automotive |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs |  | $ 0.6

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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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