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Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 29, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stock-based compensation expense [Line Items]            
Share based compensation expense   $ 45.3 $ 42.6   $ 86.0 $ 87.9
Income tax benefit   9.9 9.0   19.0 19.1
Net income effect of share-based compensation   35.4 33.6   67.0 68.8
Awards assumed       $ 53.9    
Microsemi Corporation | Restricted Stock Units (RSUs)            
Stock-based compensation expense [Line Items]            
Share based compensation expense           40.2
Awards assumed $ 175.4          
Compensation costs recognized 53.9          
Total compensation cost not yet recognized $ 121.5          
Accelerated compensation costs           17.1
Inventory            
Stock-based compensation expense [Line Items]            
Capitalized share-based compensation expense   5.5 4.4   10.3 7.9
Share-based compensation expense previously capitalized   5.2 3.9   10.1 7.5
Inventory | Microsemi Corporation | Restricted Stock Units (RSUs)            
Stock-based compensation expense [Line Items]            
Capitalized share-based compensation expense           1.6
Cost of sales            
Stock-based compensation expense [Line Items]            
Share based compensation expense   5.2 3.9   10.1 7.5
Research and development            
Stock-based compensation expense [Line Items]            
Share based compensation expense   22.3 19.7   41.8 33.8
Selling, general and administrative            
Stock-based compensation expense [Line Items]            
Share based compensation expense   17.8 17.8   34.1 29.5
Special charges and other, net            
Stock-based compensation expense [Line Items]            
Share based compensation expense   $ 0.0 $ 1.2   $ 0.0 $ 17.1