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Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended
May 29, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock-based compensation expense [Line Items]      
Share based compensation expense   $ 40.7 $ 45.3
Income tax benefit   9.1 10.1
Net income effect of share-based compensation   31.6 35.2
Awards assumed     53.9
Cost of sales      
Stock-based compensation expense [Line Items]      
Share based compensation expense   4.9 3.6
Research and development      
Stock-based compensation expense [Line Items]      
Share based compensation expense   19.5 14.1
Selling, general and administrative      
Stock-based compensation expense [Line Items]      
Share based compensation expense   16.3 11.7
Special charges and other, net      
Stock-based compensation expense [Line Items]      
Share based compensation expense   0.0 15.9
Inventory      
Stock-based compensation expense [Line Items]      
Capitalized share-based compensation expense   4.8 3.5
Share-based compensation expense previously capitalized   $ 4.9 3.6
Restricted Stock Units (RSUs) | Microsemi Corporation      
Stock-based compensation expense [Line Items]      
Share based compensation expense     21.9
Awards assumed $ 175.4    
Compensation costs recognized 53.9    
Total compensation cost not yet recognized $ 121.5    
Accelerated compensation costs     15.9
Restricted Stock Units (RSUs) | Inventory | Microsemi Corporation      
Stock-based compensation expense [Line Items]      
Income tax benefit     $ 0.4