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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 |  |  |  |

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