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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 26, 2019
Oct. 31, 2020
Oct. 26, 2019
Disaggregation of Revenue [Line Items]        
Net Sales $ 300.8 $ 257.2 $ 491.7 $ 527.4
Goods Transferred at a Point in Time        
Disaggregation of Revenue [Line Items]        
Net Sales 291.8 245.8 477.7 508.8
Goods Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Net Sales 9.0 11.4 14.0 18.6
Auto        
Disaggregation of Revenue [Line Items]        
Net Sales 215.7 180.1 340.8 366.3
Auto | Goods Transferred at a Point in Time        
Disaggregation of Revenue [Line Items]        
Net Sales 206.7 168.7 326.8 347.7
Auto | Goods Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Net Sales 9.0 11.4 14.0 18.6
Industrial        
Disaggregation of Revenue [Line Items]        
Net Sales 67.9 64.9 119.9 135.7
Industrial | Goods Transferred at a Point in Time        
Disaggregation of Revenue [Line Items]        
Net Sales 67.9 64.9 119.9 135.7
Interface        
Disaggregation of Revenue [Line Items]        
Net Sales 16.4 11.9 29.8 24.8
Interface | Goods Transferred at a Point in Time        
Disaggregation of Revenue [Line Items]        
Net Sales 16.4 11.9 29.8 24.8
Medical        
Disaggregation of Revenue [Line Items]        
Net Sales 0.8 0.3 1.2 0.6
Medical | Goods Transferred at a Point in Time        
Disaggregation of Revenue [Line Items]        
Net Sales 0.8 0.3 1.2 0.6
North America        
Disaggregation of Revenue [Line Items]        
Net Sales 176.6 164.7 287.1 348.0
North America | Auto        
Disaggregation of Revenue [Line Items]        
Net Sales 117.8 106.7 194.1 228.3
North America | Industrial        
Disaggregation of Revenue [Line Items]        
Net Sales 41.8 45.9 62.4 94.8
North America | Interface        
Disaggregation of Revenue [Line Items]        
Net Sales 16.2 11.8 29.4 24.3
North America | Medical        
Disaggregation of Revenue [Line Items]        
Net Sales 0.8 0.3 1.2 0.6
Europe & Africa        
Disaggregation of Revenue [Line Items]        
Net Sales 74.9 64.7 116.5 126.3
Europe & Africa | Auto        
Disaggregation of Revenue [Line Items]        
Net Sales 58.2 52.7 87.0 101.7
Europe & Africa | Industrial        
Disaggregation of Revenue [Line Items]        
Net Sales 16.7 11.9 29.5 24.4
Europe & Africa | Interface        
Disaggregation of Revenue [Line Items]        
Net Sales   0.1   0.2
Asia        
Disaggregation of Revenue [Line Items]        
Net Sales 49.3 27.8 88.1 53.1
Asia | Auto        
Disaggregation of Revenue [Line Items]        
Net Sales 39.7 20.7 59.7 36.3
Asia | Industrial        
Disaggregation of Revenue [Line Items]        
Net Sales 9.4 $ 7.1 28.0 16.5
Asia | Interface        
Disaggregation of Revenue [Line Items]        
Net Sales $ 0.2   $ 0.4 $ 0.3