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Business Acquisitions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 29, 2018
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Business Acquisition [Line Items]          
Acquisition of Microsemi, net of cash acquired     $ 7,850.6 $ 0.0  
Microsemi Corporation          
Business Acquisition [Line Items]          
Cash paid for shares $ 8,190.0        
Non cash consideration of certain share-based payment awards 53.9        
Total consideration transferred 8,240.0        
Liabilities assumed   $ 3,223.7 3,223.7   $ 3,152.2
Payments to acquire businesses portion funded by additional line of credit borrowings 8,100.0        
Transaction and other fees incurred in transaction $ 22.0        
Useful life (in years) 9 years        
Deferred tax liabilities $ 851.4        
Net sales   431.7 620.2    
Net income (loss)   $ (216.4) $ (250.4)    
Revolving credit facility | Microsemi Corporation          
Business Acquisition [Line Items]          
Payments to acquire businesses portion funded by additional line of credit borrowings 3,100.0        
Term Loan Facility | Microsemi Corporation          
Business Acquisition [Line Items]          
Payments to acquire businesses portion funded by additional line of credit borrowings 3,000.0        
Senior Secured Notes | Microsemi Corporation          
Business Acquisition [Line Items]          
Payments to acquire businesses portion funded by additional line of credit borrowings 2,000.0        
Other Liabilities | Microsemi Corporation          
Business Acquisition [Line Items]          
Acquisition of Microsemi, net of cash acquired $ 2,060.0