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REVENUE - Impact of Changes in Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 27, 2018
Oct. 28, 2017
Oct. 27, 2018
Oct. 28, 2017
Apr. 29, 2018
Apr. 28, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net Sales $ 264.0 $ 230.1 $ 487.4 $ 431.3    
Cost of Products Sold 193.2 $ 168.1 356.5 $ 313.7    
Total Inventories 118.3   118.3     $ 84.1
Contract Assets 0.9   0.9   $ 0.8  
Contract Liabilities 0.2   0.2   $ 0.2  
Retained Earnings 500.0   500.0     $ 472.0
Adjustments | Accounting Standards Update 2016-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net Sales (8.9)   (16.0)      
Cost of Products Sold (8.8)   (16.0)      
Total Inventories (0.6)   (0.6)      
Contract Assets 0.9   0.9      
Contract Liabilities 0.2   0.2      
Retained Earnings 0.1   0.1      
Balance Under ASC 605            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net Sales 272.9   503.4      
Cost of Products Sold 202.0   372.5      
Total Inventories 118.9   118.9      
Contract Assets 0.0   0.0      
Contract Liabilities 0.0   0.0      
Retained Earnings $ 499.9   $ 499.9