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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