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Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
May 29, 2018
Stock-based compensation expense [Line Items]      
Allocated share-based compensation expense $ 45.3 $ 22.4  
Income tax benefit 10.1 7.4  
Net income effect of share-based compensation 35.2 15.0  
Share-based compensation expense previously capitalized 3.6    
Inventory      
Stock-based compensation expense [Line Items]      
Income tax benefit 3.5 2.7  
Share-based compensation expense previously capitalized   3.4  
Cost of Sales      
Stock-based compensation expense [Line Items]      
Allocated share-based compensation expense 3.6 3.4  
Research and development      
Stock-based compensation expense [Line Items]      
Allocated share-based compensation expense 14.1 10.3  
Selling, General and Administrative      
Stock-based compensation expense [Line Items]      
Allocated share-based compensation expense 11.7 8.7  
Special charges and other, net      
Stock-based compensation expense [Line Items]      
Allocated share-based compensation expense 15.9 0.0  
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09, Excess Tax Benefit Component      
Stock-based compensation expense [Line Items]      
Allocated share-based compensation expense 5.0 $ 5.9  
Restricted Stock Units (RSUs) | Microsemi Corporation      
Stock-based compensation expense [Line Items]      
Allocated share-based compensation expense 21.9    
Consideration transferred, equity interests issued 175.4    
Compensation cost 53.9    
Compensation cost not yet recognized     $ 121.5
Accelerated compensation cost 15.9    
Restricted Stock Units (RSUs) | Microsemi Corporation | Inventory      
Stock-based compensation expense [Line Items]      
Income tax benefit $ 0.4