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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 27, 2019
Sep. 12, 2018
Oct. 03, 2017
Jul. 27, 2017
Apr. 27, 2019
Apr. 28, 2018
Business Acquisition [Line Items]            
Payments to acquire businesses, net of cash acquired         $ 422.1 $ 130.9
Grakon            
Business Acquisition [Line Items]            
Percentage acquired   100.00%        
Payments to acquire businesses, net of cash acquired   $ 422.1        
Goodwill, increase (decrease) $ (0.2)          
Acquisition-related costs incurred         15.4  
Grakon | Selling and Administrative Expenses            
Business Acquisition [Line Items]            
Acquisition-related costs incurred         9.8  
Grakon | Cost of Products Sold            
Business Acquisition [Line Items]            
Acquisition-related costs incurred         $ 5.6  
Procoplast            
Business Acquisition [Line Items]            
Percentage acquired       100.00%    
Payments to acquire businesses, net of cash acquired       $ 22.2    
Amortization period       14 years 4 months 24 days    
Pacific Insight            
Business Acquisition [Line Items]            
Percentage acquired     100.00%      
Payments to acquire businesses, net of cash acquired     $ 108.7      
Amortization period     10 years 8 months 12 days      
Procoplast and Pacific Insight            
Business Acquisition [Line Items]            
Acquisition-related costs incurred           6.8
Procoplast and Pacific Insight | Selling and Administrative Expenses            
Business Acquisition [Line Items]            
Acquisition-related costs incurred           6.0
Procoplast and Pacific Insight | Cost of Products Sold            
Business Acquisition [Line Items]            
Acquisition-related costs incurred           $ 0.8